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diff --git a/extras/expat/doc/reference.html b/extras/expat/doc/reference.html index fc4d4c0b1..1d94279e8 100644 --- a/extras/expat/doc/reference.html +++ b/extras/expat/doc/reference.html @@ -1,172 +1,185 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" - "http://www.w3.org/TR/REC-html40/loose.dtd"> +<?xml version="1.0" encoding="iso-8859-1"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> - <!-- Copyright 1999,2000 Clark Cooper <coopercc@netheaven.com> All rights reserved. This is free software. You may distribute or modify according to the terms of the MIT/X License --> <title>Expat XML Parser</title> - <meta name="author" content="Clark Cooper, coopercc@netheaven.com"> - <meta http-equiv="Content-Style-Type" content="text/css"> - <link href="style.css" rel="stylesheet" type="text/css"> + <meta name="author" content="Clark Cooper, coopercc@netheaven.com" /> + <meta http-equiv="Content-Style-Type" content="text/css" /> + <link href="style.css" rel="stylesheet" type="text/css" /> </head> <body> <h1>Expat XML Parser</h1> -<p>Expat is a library, written in C, for parsing XML documents. It's the -underlying XML parser for the open source Mozilla project, perl's -XML::Parser, and other open-source XML parsers.</p> +<p>Expat is a library, written in C, for parsing XML documents. It's +the underlying XML parser for the open source Mozilla project, Perl's +<code>XML::Parser</code>, Python's <code>xml.parsers.expat</code>, and +other open-source XML parsers.</p> <p>This library is the creation of James Clark, who's also given us -groff (an nroff look-alike), Jade (an implemention of ISO's DSSSL stylesheet -language for SGML), XP (a Java XML parser package), XT (a Java XSL engine). -James was also the technical lead on the XML Working Group at W3 that produced -the XML specification.</p> - -<p>This is free software, licensed under the -<a href="../COPYING">MIT/X Consortium license</a>. You may download it from -<a href="http://www.libexpat.org/">the Expat home page</a>. +groff (an nroff look-alike), Jade (an implemention of ISO's DSSSL +stylesheet language for SGML), XP (a Java XML parser package), XT (a +Java XSL engine). James was also the technical lead on the XML +Working Group at W3C that produced the XML specification.</p> + +<p>This is free software, licensed under the <a +href="../COPYING">MIT/X Consortium license</a>. You may download it +from <a href="http://www.libexpat.org/">the Expat home page</a>. </p> <p>The bulk of this document was originally commissioned as an article by -<a href="http://www.xml.com/">XML.com</a>. They graciously allowed me to retain -copyright and to distribute it with expat. +<a href="http://www.xml.com/">XML.com</a>. They graciously allowed +Clark Cooper to retain copyright and to distribute it with Expat.</p> -<hr> +<hr /> <h2>Table of Contents</h2> <ul> <li><a href="#overview">Overview</a></li> <li><a href="#building">Building and Installing</a></li> - <li><a href="#using">Using expat</a></li> - <li><a href="#examples">Some examples</a></li> + <li><a href="#using">Using Expat</a></li> <li><a href="#reference">Reference</a> - <ul> - <li><a href="#creation">Parser Creation Functions</a> - <ul> - <li><a href="#XML_ParserCreate">XML_ParserCreate</a></li> - <li><a href="#XML_ParserCreateNS">XML_ParserCreateNS</a></li> - <li><a href="#XML_ParserCreate_MM">XML_ParserCreate_MM</a></li> - <li><a href="#XML_ExternalEntityParserCreate">XML_ExternalEntityParserCreate</a></li> - <li><a href="#XML_ParserFree">XML_ParserFree</a></li> - </ul> - </li> - <li><a href="#parsing">Parsing Functions</a> - <ul> - <li><a href="#XML_Parse">XML_Parse</a></li> - <li><a href="#XML_ParseBuffer">XML_ParseBuffer</a></li> - <li><a href="#XML_GetBuffer">XML_GetBuffer</a></li> - </ul> - </li> - <li><a href="#setting">Handler Setting Functions</a> - <ul> - <li><a href="#XML_SetStartElementHandler">XML_SetStartElementHandler</a></li> - <li><a href="#XML_SetEndElementHandler">XML_SetEndElementHandler</a></li> - <li><a href="#XML_SetElementHandler">XML_SetElementHandler</a></li> - <li><a href="#XML_SetCharacterDataHandler">XML_SetCharacterDataHandler</a></li> - <li><a href="#XML_SetProcessingInstructionHandler">XML_SetProcessingInstructionHandler</a></li> - <li><a href="#XML_SetCommentHandler">XML_SetCommentHandler</a></li> - <li><a href="#XML_SetStartCdataSectionHandler">XML_SetStartCdataSectionHandler</a></li> - <li><a href="#XML_SetEndCdataSectionHandler">XML_SetEndCdataSectionHandler</a></li> - <li><a href="#XML_SetCdataSectionHandler">XML_SetCdataSectionHandler</a></li> - <li><a href="#XML_SetDefaultHandler">XML_SetDefaultHandler</a></li> - <li><a href="#XML_SetDefaultHandlerExpand">XML_SetDefaultHandlerExpand</a></li> - <li><a href="#XML_SetExternalEntityRefHandler">XML_SetExternalEntityRefHandler</a></li> - <li><a href="#XML_SetSkippedEntityHandler">XML_SetSkippedEntityHandler</a></li> - <li><a href="#XML_SetUnknownEncodingHandler">XML_SetUnknownEncodingHandler</a></li> - <li><a href="#XML_SetStartNamespaceDeclHandler">XML_SetStartNamespaceDeclHandler</a></li> - <li><a href="#XML_SetEndNamespaceDeclHandler">XML_SetEndNamespaceDeclHandler</a></li> - <li><a href="#XML_SetNamespaceDeclHandler">XML_SetNamespaceDeclHandler</a></li> - <li><a href="#XML_SetXmlDeclHandler">XML_SetXmlDeclHandler</a></li> - <li><a href="#XML_SetStartDoctypeDeclHandler">XML_SetStartDoctypeDeclHandler</a></li> - <li><a href="#XML_SetEndDoctypeDeclHandler">XML_SetEndDoctypeDeclHandler</a></li> - <li><a href="#XML_SetDoctypeDeclHandler">XML_SetDoctypeDeclHandler</a></li> - <li><a href="#XML_SetElementDeclHandler">XML_SetElementDeclHandler</a></li> - <li><a href="#XML_SetAttlistDeclHandler">XML_SetAttlistDeclHandler</a></li> - <li><a href="#XML_SetEntityDeclHandler">XML_SetEntityDeclHandler</a></li> - <li><a href="#XML_SetUnparsedEntityDeclHandler">XML_SetUnparsedEntityDeclHandler</a></li> - <li><a href="#XML_SetNotationDeclHandler">XML_SetNotationDeclHandler</a></li> - <li><a href="#XML_SetNotStandaloneHandler">XML_SetNotStandaloneHandler</a></li> - </ul> - </li> - <li><a href="#position">Parse Position and Error Reporting Functions</a> - <ul> - <li><a href="#XML_GetErrorCode">XML_GetErrorCode</a></li> - <li><a href="#XML_ErrorString">XML_ErrorString</a></li> - <li><a href="#XML_GetCurrentByteIndex">XML_GetCurrentByteIndex</a></li> - <li><a href="#XML_GetCurrentLineNumber">XML_GetCurrentLineNumber</a></li> - <li><a href="#XML_GetCurrentColumnNumber">XML_GetCurrentColumnNumber</a></li> - <li><a href="#XML_GetCurrentByteCount">XML_GetCurrentByteCount</a></li> - <li><a href="#XML_GetInputContext">XML_GetInputContext</a></li> - </ul> - </li> - <li><a href="#miscellaneous">Miscellaneous Functions</a> - <ul> - <li><a href="#XML_SetUserData">XML_SetUserData</a></li> - <li><a href="#XML_GetUserData">XML_GetUserData</a></li> - <li><a href="#XML_UseParserAsHandlerArg">XML_UseParserAsHandlerArg</a></li> - <li><a href="#XML_SetBase">XML_SetBase</a></li> - <li><a href="#XML_GetBase">XML_GetBase</a></li> - <li><a href="#XML_GetSpecifiedAttributeCount">XML_GetSpecifiedAttributeCount</a></li> - <li><a href="#XML_GetIdAttributeIndex">XML_GetIdAttributeIndex</a></li> - <li><a href="#XML_SetEncoding">XML_SetEncoding</a></li> - <li><a href="#XML_SetParamEntityParsing">XML_SetParamEntityParsing</a></li> - <li><a href="#XML_SetReturnNSTriplet">XML_SetReturnNSTriplet</a></li> - <li><a href="#XML_ExpatVersion">XML_ExpatVersion</a></li> - <li><a href="#XML_ExpatVersionInfo">XML_ExpatVersionInfo</a></li> - </ul> - </li> - </ul> + <ul> + <li><a href="#creation">Parser Creation Functions</a> + <ul> + <li><a href="#XML_ParserCreate">XML_ParserCreate</a></li> + <li><a href="#XML_ParserCreateNS">XML_ParserCreateNS</a></li> + <li><a href="#XML_ParserCreate_MM">XML_ParserCreate_MM</a></li> + <li><a href="#XML_ExternalEntityParserCreate">XML_ExternalEntityParserCreate</a></li> + <li><a href="#XML_ParserFree">XML_ParserFree</a></li> + <li><a href="#XML_ParserReset">XML_ParserReset</a></li> + </ul> + </li> + <li><a href="#parsing">Parsing Functions</a> + <ul> + <li><a href="#XML_Parse">XML_Parse</a></li> + <li><a href="#XML_ParseBuffer">XML_ParseBuffer</a></li> + <li><a href="#XML_GetBuffer">XML_GetBuffer</a></li> + </ul> + </li> + <li><a href="#setting">Handler Setting Functions</a> + <ul> + <li><a href="#XML_SetStartElementHandler">XML_SetStartElementHandler</a></li> + <li><a href="#XML_SetEndElementHandler">XML_SetEndElementHandler</a></li> + <li><a href="#XML_SetElementHandler">XML_SetElementHandler</a></li> + <li><a href="#XML_SetCharacterDataHandler">XML_SetCharacterDataHandler</a></li> + <li><a href="#XML_SetProcessingInstructionHandler">XML_SetProcessingInstructionHandler</a></li> + <li><a href="#XML_SetCommentHandler">XML_SetCommentHandler</a></li> + <li><a href="#XML_SetStartCdataSectionHandler">XML_SetStartCdataSectionHandler</a></li> + <li><a href="#XML_SetEndCdataSectionHandler">XML_SetEndCdataSectionHandler</a></li> + <li><a href="#XML_SetCdataSectionHandler">XML_SetCdataSectionHandler</a></li> + <li><a href="#XML_SetDefaultHandler">XML_SetDefaultHandler</a></li> + <li><a href="#XML_SetDefaultHandlerExpand">XML_SetDefaultHandlerExpand</a></li> + <li><a href="#XML_SetExternalEntityRefHandler">XML_SetExternalEntityRefHandler</a></li> + <li><a href="#XML_SetExternalEntityRefHandlerArg">XML_SetExternalEntityRefHandlerArg</a></li> + <li><a href="#XML_SetSkippedEntityHandler">XML_SetSkippedEntityHandler</a></li> + <li><a href="#XML_SetUnknownEncodingHandler">XML_SetUnknownEncodingHandler</a></li> + <li><a href="#XML_SetStartNamespaceDeclHandler">XML_SetStartNamespaceDeclHandler</a></li> + <li><a href="#XML_SetEndNamespaceDeclHandler">XML_SetEndNamespaceDeclHandler</a></li> + <li><a href="#XML_SetNamespaceDeclHandler">XML_SetNamespaceDeclHandler</a></li> + <li><a href="#XML_SetXmlDeclHandler">XML_SetXmlDeclHandler</a></li> + <li><a href="#XML_SetStartDoctypeDeclHandler">XML_SetStartDoctypeDeclHandler</a></li> + <li><a href="#XML_SetEndDoctypeDeclHandler">XML_SetEndDoctypeDeclHandler</a></li> + <li><a href="#XML_SetDoctypeDeclHandler">XML_SetDoctypeDeclHandler</a></li> + <li><a href="#XML_SetElementDeclHandler">XML_SetElementDeclHandler</a></li> + <li><a href="#XML_SetAttlistDeclHandler">XML_SetAttlistDeclHandler</a></li> + <li><a href="#XML_SetEntityDeclHandler">XML_SetEntityDeclHandler</a></li> + <li><a href="#XML_SetUnparsedEntityDeclHandler">XML_SetUnparsedEntityDeclHandler</a></li> + <li><a href="#XML_SetNotationDeclHandler">XML_SetNotationDeclHandler</a></li> + <li><a href="#XML_SetNotStandaloneHandler">XML_SetNotStandaloneHandler</a></li> + </ul> + </li> + <li><a href="#position">Parse Position and Error Reporting Functions</a> + <ul> + <li><a href="#XML_GetErrorCode">XML_GetErrorCode</a></li> + <li><a href="#XML_ErrorString">XML_ErrorString</a></li> + <li><a href="#XML_GetCurrentByteIndex">XML_GetCurrentByteIndex</a></li> + <li><a href="#XML_GetCurrentLineNumber">XML_GetCurrentLineNumber</a></li> + <li><a href="#XML_GetCurrentColumnNumber">XML_GetCurrentColumnNumber</a></li> + <li><a href="#XML_GetCurrentByteCount">XML_GetCurrentByteCount</a></li> + <li><a href="#XML_GetInputContext">XML_GetInputContext</a></li> + </ul> + </li> + <li><a href="#miscellaneous">Miscellaneous Functions</a> + <ul> + <li><a href="#XML_SetUserData">XML_SetUserData</a></li> + <li><a href="#XML_GetUserData">XML_GetUserData</a></li> + <li><a href="#XML_UseParserAsHandlerArg">XML_UseParserAsHandlerArg</a></li> + <li><a href="#XML_SetBase">XML_SetBase</a></li> + <li><a href="#XML_GetBase">XML_GetBase</a></li> + <li><a href="#XML_GetSpecifiedAttributeCount">XML_GetSpecifiedAttributeCount</a></li> + <li><a href="#XML_GetIdAttributeIndex">XML_GetIdAttributeIndex</a></li> + <li><a href="#XML_SetEncoding">XML_SetEncoding</a></li> + <li><a href="#XML_SetParamEntityParsing">XML_SetParamEntityParsing</a></li> + <li><a href="#XML_UseForeignDTD">XML_UseForeignDTD</a></li> + <li><a href="#XML_SetReturnNSTriplet">XML_SetReturnNSTriplet</a></li> + <li><a href="#XML_DefaultCurrent">XML_DefaultCurrent</a></li> + <li><a href="#XML_ExpatVersion">XML_ExpatVersion</a></li> + <li><a href="#XML_ExpatVersionInfo">XML_ExpatVersionInfo</a></li> + <li><a href="#XML_GetFeatureList">XML_GetFeatureList</a></li> + <li><a href="#XML_FreeContentModel">XML_FreeContentModel</a></li> + <li><a href="#XML_MemMalloc">XML_MemMalloc</a></li> + <li><a href="#XML_MemRealloc">XML_MemRealloc</a></li> + <li><a href="#XML_MemFree">XML_MemFree</a></li> + </ul> + </li> + </ul> </li> </ul> -<hr> +<hr /> <h2><a name="overview">Overview</a></h2> -<p>Expat is a stream-oriented parser. You register callback (or handler) -functions with -the parser and then start feeding it the document. -As the parser recognizes parts of -the document, it will call the appropriate handler for that part (if you've -registered one.) The document is fed to the parser in pieces, so you can -start parsing before you have all the document. This also allows you to -parse really huge documents that won't fit into memory.</p> - -<p>Expat can be intimidating due to the many kinds of handlers and options -you can set. But you only need to learn four functions in order to do 90% -of what you'll want to do with it:</p> + +<p>Expat is a stream-oriented parser. You register callback (or +handler) functions with the parser and then start feeding it the +document. As the parser recognizes parts of the document, it will +call the appropriate handler for that part (if you've registered one.) +The document is fed to the parser in pieces, so you can start parsing +before you have all the document. This also allows you to parse really +huge documents that won't fit into memory.</p> + +<p>Expat can be intimidating due to the many kinds of handlers and +options you can set. But you only need to learn four functions in +order to do 90% of what you'll want to do with it:</p> <dl> -<dt><code>XML_ParserCreate</code></dt> +<dt><code><a href= "#XML_ParserCreate" + >XML_ParserCreate</a></code></dt> <dd>Create a new parser object.</dd> -<dt><code>XML_SetElementHandler</code></dt> +<dt><code><a href= "#XML_SetElementHandler" + >XML_SetElementHandler</a></code></dt> <dd>Set handlers for start and end tags.</dd> -<dt><code>XML_SetCharacterDataHandler</code></dt> +<dt><code><a href= "#XML_SetCharacterDataHandler" + >XML_SetCharacterDataHandler</a></code></dt> <dd>Set handler for text.</dd> -<dt><code>XML_Parse</code></dt> +<dt><code><a href= "#XML_Parse" + >XML_Parse</a></code></dt> <dd>Pass a buffer full of document to the parser</dd> </dl> -<p>These functions and others are described in the -<a href="#reference">reference</a> part of this document. The reference -section also describes in detail the parameters passed to the different -types of handlers. - -<p>Let's look at a very simple example program that only uses 3 of the above -functions (it doesn't need to set a character handler.) The program -<a href="../examples/outline.c">outline.c</a> -prints an element outline, indenting child elements to distinguish them from -the parent element that contains them. The start handler does all the work. -It prints two indenting spaces for every level of ancestor elements, then -it prints the element and attribute information. Finally it increments the -global Depth variable. - -<div class="eg"> -<pre> +<p>These functions and others are described in the <a +href="#reference">reference</a> part of this document. The reference +section also describes in detail the parameters passed to the +different types of handlers.</p> + +<p>Let's look at a very simple example program that only uses 3 of the +above functions (it doesn't need to set a character handler.) The +program <a href="../examples/outline.c">outline.c</a> prints an +element outline, indenting child elements to distinguish them from the +parent element that contains them. The start handler does all the +work. It prints two indenting spaces for every level of ancestor +elements, then it prints the element and attribute +information. Finally it increments the global <code>Depth</code> +variable.</p> + +<pre class="eg"> int Depth; void @@ -186,98 +199,98 @@ start(void *data, const char *el, const char **attr) { Depth++; } /* End of start handler */ </pre> -</div> -<p>The end tag simply does the bookkeeping work of decrementing the Depth. -<div class="eg"> -<pre> +<p>The end tag simply does the bookkeeping work of decrementing +<code>Depth</code>.</p> +<pre class="eg"> void end(void *data, const char *el) { Depth--; } /* End of end handler */ </pre> -</div> <p>After creating the parser, the main program just has the job of -shoveling the document to the parser so that it can do its work. +shoveling the document to the parser so that it can do its work.</p> + +<hr /> +<h2><a name="building">Building and Installing Expat</a></h2> -<hr> -<h2><a name="building">Building and Installing expat</a></h2> -<p>The expat distribution comes as a compressed (with GNU gzip) tar file. -You may download the latest version from -<a href="http://sourceforge.net/projects/expat/">Source Forge</a>. -After unpacking this, cd into the directory. Then follow either the -Win32 directions or Unix directions below.</p> +<p>The Expat distribution comes as a compressed (with GNU gzip) tar +file. You may download the latest version from <a href= +"http://sourceforge.net/projects/expat/" >Source Forge</a>. After +unpacking this, cd into the directory. Then follow either the Win32 +directions or Unix directions below.</p> <h3>Building under Win32</h3> -<p>If you're using the GNU compiler under cygwin, follow the Unix directions -in the next section. Otherwise if you have Microsoft's Developer Studio -installed, then from Windows Explorer double-click on "expat.dsp" in the -lib directory and build and install in the usual manner.</p> -<p>Alternatively, you may download the win32 binary package that contains -the expat.h include file and a pre-built dll.</p> +<p>If you're using the GNU compiler under cygwin, follow the Unix +directions in the next section. Otherwise if you have Microsoft's +Developer Studio installed, then from Windows Explorer double-click on +"expat.dsp" in the lib directory and build and install in the usual +manner.</p> + +<p>Alternatively, you may download the Win32 binary package that +contains the "expat.h" include file and a pre-built DLL.</p> <h3>Building under Unix (or GNU)</h3> -<p>First you'll need to run the configure shell script in order to configure -the Makefiles and headers for your system.</p> + +<p>First you'll need to run the configure shell script in order to +configure the Makefiles and headers for your system.</p> <p>If you're happy with all the defaults that configure picks for you, -and you have permission on your system to install into /usr/local, you can -install expat with this sequence of commands:</p> +and you have permission on your system to install into /usr/local, you +can install Expat with this sequence of commands:</p> -<pre> +<pre class="eg"> ./configure make make install </pre> <p>There are some options that you can provide to this script, but the -only one we'll mention here is the <code>--prefix</code> option. You can -find out all the options available by running configure with just the -<code>--help</code> option. -</p> +only one we'll mention here is the <code>--prefix</code> option. You +can find out all the options available by running configure with just +the <code>--help</code> option.</p> + +<p>By default, the configure script sets things up so that the library +gets installed in <code>/usr/local/lib</code> and the associated +header file in <code>/usr/local/include</code>. But if you were to +give the option, <code>--prefix=/home/me/mystuff</code>, then the +library and header would get installed in +<code>/home/me/mystuff/lib</code> and +<code>/home/me/mystuff/include</code> respectively.</p> + +<hr /> +<h2><a name="using">Using Expat</a></h2> -By default, the configure script sets things up so that the library gets -installed in <code>/usr/local/lib</code> and the associated header file in -<code>/usr/local/include</code>. -But if you were to give the option, <code>--prefix=/home/me/mystuff</code>, -then the library and header would get installed in -<code>/home/me/mystuff/lib</code> and <code>/home/me/mystuff/include</code> -respectively. -</p> +<h3>Compiling and Linking Against Expat</h3> -<hr> -<h2><a name="using">Using Expat</a></h2> -<h3>Compiling and Linking against expat</h3> -<p>Unless you installed expat in a location not expected by your compiler -and linker, all you have to do to use expat in your programs is to include -the expat header (<code>#include <expat.h></code>) in your files that -make calls to it and to tell the linker -that it needs to link against the expat library. On Unix systems, this would -be the <code>-lexpat</code> argument. -Otherwise, you'll need to tell the compiler where to look for the expat header -and the linker where to find the expat library. You may also need to take -steps to tell the operating system where to find this libary at run time. -</p> -<p>On a Unix based system, here's what a Makefile might look like when expat -is installed in a standard location:</p> +<p>Unless you installed Expat in a location not expected by your +compiler and linker, all you have to do to use Expat in your programs +is to include the Expat header (<code>#include <expat.h></code>) +in your files that make calls to it and to tell the linker that it +needs to link against the Expat library. On Unix systems, this would +usually be done with the <code>-lexpat</code> argument. Otherwise, +you'll need to tell the compiler where to look for the Expat header +and the linker where to find the Expat library. You may also need to +take steps to tell the operating system where to find this libary at +run time.</p> -<div class="eg"> -<pre> +<p>On a Unix-based system, here's what a Makefile might look like when +Expat is installed in a standard location:</p> + +<pre class="eg"> CC=cc LDFLAGS= LIBS= -lexpat xmlapp: xmlapp.o $(CC) $(LDFLAGS) -o xmlapp xmlapp.o $(LIBS) </pre> -</div> -<p>If you installed expat in, say, <code>/home/me/mystuff</code>, then +<p>If you installed Expat in, say, <code>/home/me/mystuff</code>, then the Makefile would look like this:</p> -<div class="eg"> -<pre> +<pre class="eg"> CC=cc CFLAGS= -I/home/me/mystuff/include LDFLAGS= @@ -285,62 +298,61 @@ LIBS= -L/home/me/mystuff/lib -lexpat xmlapp: xmlapp.o $(CC) $(LDFLAGS) -o xmlapp xmlapp.o $(LIBS) </pre> -</div> -<p>You'd also have to set the environment variable <code>LD_LIBRARY_PATH</code> -to <code>/home/me/mystuff/lib</code> (or to -<code>${LD_LIBRARY_PATH}:/home/me/mystuff/lib</code> if LD_LIBRARY_PATH -already has some directories in it) in order to run your application. -</p> +<p>You'd also have to set the environment variable +<code>LD_LIBRARY_PATH</code> to <code>/home/me/mystuff/lib</code> (or +to <code>${LD_LIBRARY_PATH}:/home/me/mystuff/lib</code> if +LD_LIBRARY_PATH already has some directories in it) in order to run +your application.</p> <h3>Expat Basics</h3> -<p>As we saw in the example in the overview, the first step in parsing an -XML document with expat is to create a parser object. There are -<a href="#creation">three functions</a> in the expat API for creating a -parser object. -However, only two of these -(<a href="#XML_ParserCreate"><code>XML_ParserCreate</code></a> and -<a href="#XML_ParserCreateNS"><code>XML_ParserCreateNS</code></a>) -can be used for constructing a parser for a top-level document. -The object returned by these functions is an opaque pointer -(i.e. expat.h declares it as void *) to data with further internal structure. -In order to free the memory associated with this object you must call -<a href="#XML_ParserFree"><code>XML_ParserFree</code></a>. Note that if -you have provided any <a href="userdata">user data</a> that gets stored -in the parser, then your application is responsible for freeing it prior to -calling XML_ParserFree. -</p> + +<p>As we saw in the example in the overview, the first step in parsing +an XML document with Expat is to create a parser object. There are <a +href="#creation">three functions</a> in the Expat API for creating a +parser object. However, only two of these (<code><a href= +"#XML_ParserCreate" >XML_ParserCreate</a></code> and <code><a href= +"#XML_ParserCreateNS" >XML_ParserCreateNS</a></code>) can be used for +constructing a parser for a top-level document. The object returned +by these functions is an opaque pointer (i.e. "expat.h" declares it as +void *) to data with further internal structure. In order to free the +memory associated with this object you must call <code><a href= +"#XML_ParserFree" >XML_ParserFree</a></code>. Note that if you have +provided any <a href="userdata">user data</a> that gets stored in the +parser, then your application is responsible for freeing it prior to +calling <code>XML_ParserFree</code>.</p> <p>The objects returned by the parser creation functions are good for -parsing only one XML document or external parsed entity. If your application -needs to parse many XML documents, then it needs to create a parser object -for each one. The best way to deal with this is to create a higher level -object that contains all the default initialization you want for your parser -objects. - -<p>Walking through a document hierarchy with a stream oriented parser will -require a good stack mechanism in order to keep track of current context. -For instance, to answer the simple question, -"What element does this text belong to?" requires a stack, since the -parser may have descended into other elements that are children of the -current one and has encountered this text on the way out. - -<p>The things you're likely to want to keep on a stack are the currently -opened element and it's attributes. You push this information onto the -stack in the start handler and you pop it off in the end handler. - -<p>For some tasks, it is sufficient to just keep information on what the -depth of the stack is (or would be if you had one.) The outline program shown -above presents one example. Another such task would be skipping over a -complete element. When you see the start tag for the element you want to -skip, you set a skip flag and record the depth at which the element started. -When the end tag handler encounters the same depth, the skipped element has -ended and the flag may be cleared. If you follow the convention that the -root element starts at 1, then you can use the same variable for skip flag -and skip depth. - -<div class="eg"> -<pre> +parsing only one XML document or external parsed entity. If your +application needs to parse many XML documents, then it needs to create +a parser object for each one. The best way to deal with this is to +create a higher level object that contains all the default +initialization you want for your parser objects.</p> + +<p>Walking through a document hierarchy with a stream oriented parser +will require a good stack mechanism in order to keep track of current +context. For instance, to answer the simple question, "What element +does this text belong to?" requires a stack, since the parser may have +descended into other elements that are children of the current one and +has encountered this text on the way out.</p> + +<p>The things you're likely to want to keep on a stack are the +currently opened element and it's attributes. You push this +information onto the stack in the start handler and you pop it off in +the end handler.</p> + +<p>For some tasks, it is sufficient to just keep information on what +the depth of the stack is (or would be if you had one.) The outline +program shown above presents one example. Another such task would be +skipping over a complete element. When you see the start tag for the +element you want to skip, you set a skip flag and record the depth at +which the element started. When the end tag handler encounters the +same depth, the skipped element has ended and the flag may be +cleared. If you follow the convention that the root element starts at +1, then you can use the same variable for skip flag and skip +depth.</p> + +<pre class="eg"> void init_info(Parseinfo *info) { info->skip = 0; @@ -375,119 +387,159 @@ rawend(void *data, const char *el) { if (inf->skip == inf->depth) inf->skip = 0; } /* End rawend */ - </pre> -</div> -<p>Notice in the above example the difference in how depth is manipulated -in the start and end handlers. The end tag handler should be the mirror -image of the start tag handler. This is necessary to properly model -containment. Since, in the start tag handler, we -incremented depth <em>after</em> the main body of start tag code, then in -the end handler, we need to manipulate it <em>before</em> the main body. -If we'd decided to increment it first thing in the start handler, then -we'd have had to decrement it last thing in the end handler. +<p>Notice in the above example the difference in how depth is +manipulated in the start and end handlers. The end tag handler should +be the mirror image of the start tag handler. This is necessary to +properly model containment. Since, in the start tag handler, we +incremented depth <em>after</em> the main body of start tag code, then +in the end handler, we need to manipulate it <em>before</em> the main +body. If we'd decided to increment it first thing in the start +handler, then we'd have had to decrement it last thing in the end +handler.</p> -<h3>Communicating between handlers</h3> +<h3 id="userdata">Communicating between handlers</h3> <p>In order to be able to pass information between different handlers without using globals, you'll need to define a data structure to hold -the shared variables. You can then tell expat (with the XML_SetUserData -function) to pass a pointer to this -structure to the handlers. This is typically the first argument received -by most handlers. +the shared variables. You can then tell Expat (with the <code><a href= +"#XML_SetUserData" >XML_SetUserData</a></code> function) to pass a +pointer to this structure to the handlers. This is typically the first +argument received by most handlers.</p> + +<h3>XML Version</h3> + +<p>Expat is an XML 1.0 parser, and as such never complains based on +the value of the <code>version</code> pseudo-attribute in the XML +declaration, if present.</p> + +<p>If an application needs to check the version number (to support +alternate processing), it should use the <code><a href= +"#XML_SetXmlDeclHandler" >XML_SetXmlDeclHandler</a></code> function to +set a handler that uses the information in the XML declaration to +determine what to do. This example shows how to check that only a +version number of <code>"1.0"</code> is accepted:</p> + +<pre class="eg"> +static int wrong_version; +static XML_Parser parser; + +static void +xmldecl_handler(void *userData, + const XML_Char *version, + const XML_Char *encoding, + int standalone) +{ + static const XML_Char Version_1_0[] = {'1', '.', '0', 0}; + + int i; + + for (i = 0; i < (sizeof(Version_1_0) / sizeof(Version_1_0[0])); ++i) { + if (version[i] != Version_1_0[i]) { + wrong_version = 1; + /* also clear all other handlers: */ + XML_SetCharacterDataHandler(parser, NULL); + ... + return; + } + } + ... +} +</pre> <h3>Namespace Processing</h3> -<p>When the parser is created using the <code>XML_ParserCreateNS</code>, -function, expat performs namespace processing. Under namespace processing, -expat consumes <code>xmlns</code> and <code>xmlns:...</code> attributes, +<p>When the parser is created using the <code><a href= +"#XML_ParserCreateNS" >XML_ParserCreateNS</a></code>, function, Expat +performs namespace processing. Under namespace processing, Expat +consumes <code>xmlns</code> and <code>xmlns:...</code> attributes, which declare namespaces for the scope of the element in which they -occur. This means that your start handler will not see these attributes. -Your application can still be informed of these declarations by setting -namespace declaration handlers with -<a href="#XML_SetNamespaceDeclHandler"> -<code>XML_SetNamespaceDeclHandler</code></a>. - -<p>Element type and attribute names that belong to a given namespace are -passed to the appropriate handler in expanded form. By default this expanded -form is a concatenation of the namespace URI, the separator character (which -is the 2nd argument to <code>XML_ParserCreateNS</code>), and the local -name (i.e. the part after the colon). Names with undeclared prefixes are -passed through to the handlers unchanged, with the prefix and colon still -attached. Unprefixed attribute names are never expanded, and unprefixed -element names are only expanded when they are in the scope of a default -namespace. - -<p>However if <a href="XML_SetReturnNSTriplet">XML_SetReturnNSTriplet</a> -has been called with a non-zero <code>do_nst</code> parameter, then the -expanded form for names with an explicit prefix is a concatenation of: -URI, separator, local name, separator, prefix. -</p> - -<p>You can set handlers for the start of a namespace declaration and for -the end of a scope of a declaration with the -<code>XML_SetNamespaceDeclHandler</code> function. -The StartNamespaceDeclHandler is called prior to the start tag handler -and the EndNamespaceDeclHandler is called before the corresponding end tag -that ends the namespace's scope. -The namespace start handler gets passed the prefix and URI for the namespace. -For a default namespace declaration (xmlns='...'), the prefix will be null. -The URI will be null for the case where the default namespace is being unset. -The namespace end handler just gets the prefix for the closing scope. - -<p>These handlers are called for each declaration. So if, for instance, a -start tag had three namespace declarations, then the StartNamespaceDeclHandler -would be called three times before the start tag handler is called, once for -each declaration. - -<p>The <a href="src/namespace.c">namespace.c</a> example demonstrates the -use of these features. Like outline.c, it produces an outline, but -in addition it annotates when a namespace scope starts and when it ends. -This example also demonstrates use of application user data. +occur. This means that your start handler will not see these +attributes. Your application can still be informed of these +declarations by setting namespace declaration handlers with <a href= +"#XML_SetNamespaceDeclHandler" +><code>XML_SetNamespaceDeclHandler</code></a>.</p> + +<p>Element type and attribute names that belong to a given namespace +are passed to the appropriate handler in expanded form. By default +this expanded form is a concatenation of the namespace URI, the +separator character (which is the 2nd argument to <code><a href= +"#XML_ParserCreateNS" >XML_ParserCreateNS</a></code>), and the local +name (i.e. the part after the colon). Names with undeclared prefixes +are passed through to the handlers unchanged, with the prefix and +colon still attached. Unprefixed attribute names are never expanded, +and unprefixed element names are only expanded when they are in the +scope of a default namespace.</p> + +<p>However if <code><a href= "XML_SetReturnNSTriplet" +>XML_SetReturnNSTriplet</a></code> has been called with a non-zero +<code>do_nst</code> parameter, then the expanded form for names with +an explicit prefix is a concatenation of: URI, separator, local name, +separator, prefix.</p> + +<p>You can set handlers for the start of a namespace declaration and +for the end of a scope of a declaration with the <code><a href= +"#XML_SetNamespaceDeclHandler" >XML_SetNamespaceDeclHandler</a></code> +function. The StartNamespaceDeclHandler is called prior to the start +tag handler and the EndNamespaceDeclHandler is called before the +corresponding end tag that ends the namespace's scope. The namespace +start handler gets passed the prefix and URI for the namespace. For a +default namespace declaration (xmlns='...'), the prefix will be null. +The URI will be null for the case where the default namespace is being +unset. The namespace end handler just gets the prefix for the closing +scope.</p> + +<p>These handlers are called for each declaration. So if, for +instance, a start tag had three namespace declarations, then the +StartNamespaceDeclHandler would be called three times before the start +tag handler is called, once for each declaration.</p> <h3>Character Encodings</h3> -<p>While XML is based on Unicode, and every XML processor is required to -recognized UTF-8 and UTF-16 (1 and 2 byte encodings of Unicode), other -encodings may be declared in XML documents or entities. For the main -document, an XML declaration may contain an encoding declaration: +<p>While XML is based on Unicode, and every XML processor is required +to recognized UTF-8 and UTF-16 (1 and 2 byte encodings of Unicode), +other encodings may be declared in XML documents or entities. For the +main document, an XML declaration may contain an encoding +declaration:</p> <pre> <?xml version="1.0" encoding="ISO-8859-2"?> </pre> <p>External parsed entities may begin with a text declaration, which -looks like an XML declaration with just an encoding declaration: +looks like an XML declaration with just an encoding declaration:</p> <pre> <?xml encoding="Big5"?> </pre> -<p>With expat, you may also specify an encoding at the time of creating a -parser. This is useful when the encoding information may come from a source -outside the document itself (like a higher level protocol.) +<p>With Expat, you may also specify an encoding at the time of +creating a parser. This is useful when the encoding information may +come from a source outside the document itself (like a higher level +protocol.)</p> -<p><a name="builtin_encodings"></a>There are four built-in encodings in expat: +<p><a name="builtin_encodings"></a>There are four built-in encodings +in Expat:</p> <ul> -<li>UTF-8 -<li>UTF-16 -<li>ISO-8859-1 -<li>US-ASCII +<li>UTF-8</li> +<li>UTF-16</li> +<li>ISO-8859-1</li> +<li>US-ASCII</li> </ul> <p>Anything else discovered in an encoding declaration or in the protocol encoding specified in the parser constructor, triggers a call to the <code>UnknownEncodingHandler</code>. This handler gets passed the encoding name and a pointer to an <code>XML_Encoding</code> data -structure. Your handler must fill in this structure and return 1 if -it knows how to deal with the encoding. Otherwise the handler should -return 0. -The handler also gets passed a pointer to an -optional application data structure that you may indicate when you set -the handler. - -<p>Expat places restrictions on character encodings that it can support -by filling in the <code>XML_Encoding</code> structure. -include file: +structure. Your handler must fill in this structure and return +<code>XML_STATUS_OK</code> if it knows how to deal with the +encoding. Otherwise the handler should return +<code>XML_STATUS_ERROR</code>. The handler also gets passed a pointer +to an optional application data structure that you may indicate when +you set the handler.</p> + +<p>Expat places restrictions on character encodings that it can +support by filling in the <code>XML_Encoding</code> structure. +include file:</p> <ol> <li>Every ASCII character that can appear in a well-formed XML document must be represented by a single byte, and that byte must correspond to @@ -500,44 +552,48 @@ for UTF-16 and UTF-8</em></li> bytes</li> </ol> -<p><code>XML_Encoding</code> contains an array of integers that correspond -to the 1st byte of an encoding sequence. If the value in the array for a -byte is zero or positive, then the byte is a single byte encoding that -encodes the Unicode scalar value contained in the array. A -1 in this array -indicates a malformed byte. If the value is --2, -3, or -4, then the byte is the beginning of a 2, 3, or 4 byte sequence -respectively. Multi-byte sequences are sent to the convert function pointed -at in the <code>XML_Encoding</code> structure. This function should return -the Unicode scalar value for the sequence or -1 if the sequence is malformed. - -<p>One pitfall that novice expat users are likely to fall into is that -although expat may accept input in various encodings, the strings that it -passes to the handlers are always encoded in UTF-8. Your application is -responsible for any translation of these strings into other encodings. +<p><code>XML_Encoding</code> contains an array of integers that +correspond to the 1st byte of an encoding sequence. If the value in +the array for a byte is zero or positive, then the byte is a single +byte encoding that encodes the Unicode scalar value contained in the +array. A -1 in this array indicates a malformed byte. If the value is +-2, -3, or -4, then the byte is the beginning of a 2, 3, or 4 byte +sequence respectively. Multi-byte sequences are sent to the convert +function pointed at in the <code>XML_Encoding</code> structure. This +function should return the Unicode scalar value for the sequence or -1 +if the sequence is malformed.</p> + +<p>One pitfall that novice Expat users are likely to fall into is that +although Expat may accept input in various encodings, the strings that +it passes to the handlers are always encoded in UTF-8 or UTF-16 +(depending on how Expat was compiled). Your application is responsible +for any translation of these strings into other encodings.</p> <h3>Handling External Entity References</h3> -<p>Expat does not read or parse external entities directly. Note that any -external DTD is a special case of an external entity. -If you've set no <code>ExternalEntityRefHandler</code>, then external -entity references are silently ignored. Otherwise, it calls your handler with -the information needed to read and parse the external entity. - -<p>Your handler -isn't actually responsible for parsing the entity, but it is responsible -for creating a subsidiary parser with -<code>XML_ExternalEntityParserCreate</code> that will do the job. This returns -an instance of <code>XML_Parser</code> that has handlers and other data -structures initialized from the parent parser. You may then use -<code>XML_Parse</code> or <code>XML_ParseBuffer</code> calls against this -parser. -Since external entities my refer to other external entities, your handler -should be prepared to be called recursively. +<p>Expat does not read or parse external entities directly. Note that +any external DTD is a special case of an external entity. If you've +set no <code>ExternalEntityRefHandler</code>, then external entity +references are silently ignored. Otherwise, it calls your handler with +the information needed to read and parse the external entity.</p> + +<p>Your handler isn't actually responsible for parsing the entity, but +it is responsible for creating a subsidiary parser with <code><a href= +"#XML_ExternalEntityParserCreate" +>XML_ExternalEntityParserCreate</a></code> that will do the job. This +returns an instance of <code>XML_Parser</code> that has handlers and +other data structures initialized from the parent parser. You may then +use <code><a href= "#XML_Parse" >XML_Parse</a></code> or <code><a +href= "#XML_ParseBuffer">XML_ParseBuffer</a></code> calls against this +parser. Since external entities my refer to other external entities, +your handler should be prepared to be called recursively.</p> <h3>Parsing DTDs</h3> -<p>In order to parse parameter entities, before starting the parse, you must -call <code>XML_SetParamEntityParsing</code> with one of the following -arguments: + +<p>In order to parse parameter entities, before starting the parse, +you must call <code><a href= "#XML_SetParamEntityParsing" +>XML_SetParamEntityParsing</a></code> with one of the following +arguments:</p> <dl> <dt><code>XML_PARAM_ENTITY_PARSING_NEVER</code></dt> <dd>Don't parse parameter entities or the external subset</dd> @@ -548,41 +604,38 @@ arguments: <dd>Always parse parameter entities and the external subset</dd> </dl> -<p>In order to read an external DTD, you also have to set an -external entity reference handler as described above. +<p>In order to read an external DTD, you also have to set an external +entity reference handler as described above.</p> -<hr> -<h2><a name="examples">Some expat Examples</a></h2> - -<hr> +<hr /> <!-- ================================================================ --> <h2><a name="reference">Expat Reference</a></h2> <h3><a name="creation">Parser Creation</a></h3> -<div class="fcndec"><a name="XML_ParserCreate"><pre> +<pre class="fcndec" id="XML_ParserCreate"> XML_Parser -XML_ParserCreate(const XML_Char *encoding) -</pre></a></div> +XML_ParserCreate(const XML_Char *encoding); +</pre> <div class="fcndef"> Construct a new parser. If encoding is non-null, it specifies a character encoding to use for the document. This overrides the document encoding declaration. There are four built-in encodings: <ul> -<li>US-ASCII -<li>UTF-8 -<li>UTF-16 -<li>ISO-8859-1 +<li>US-ASCII</li> +<li>UTF-8</li> +<li>UTF-16</li> +<li>ISO-8859-1</li> </ul> Any other value will invoke a call to the UnknownEncodingHandler. </div> -<div class="fcndec"><a name="XML_ParserCreateNS"><pre> +<pre class="fcndec" id="XML_ParserCreateNS"> XML_Parser XML_ParserCreateNS(const XML_Char *encoding, - XML_Char sep) -</pre></a></div> + XML_Char sep); +</pre> <div class="fcndef"> Constructs a new parser that has namespace processing in effect. Namespace expanded element names and attribute names are returned as a concatenation @@ -590,63 +643,94 @@ of the namespace URI, <em>sep</em>, and the local part of the name. This means that you should pick a character for <em>sep</em> that can't be part of a legal URI.</div> -<div class="fcndec"><a name="XML_ParserCreate_MM"><pre> +<pre class="fcndec" id="XML_ParserCreate_MM"> XML_Parser XML_ParserCreate_MM(const XML_Char *encoding, const XML_Memory_Handling_Suite *ms, - const XML_Char *sep) -</pre></a></div> + const XML_Char *sep); +</pre> +<pre class="signature"> +typedef struct { + void *(*malloc_fcn)(size_t size); + void *(*realloc_fcn)(void *ptr, size_t size); + void (*free_fcn)(void *ptr); +} XML_Memory_Handling_Suite; +</pre> <div class="fcndef"> <p>Construct a new parser using the suite of memory handling functions specified in <code>ms</code>. If <code>ms</code> is NULL, then use the standard set of memory management functions. If <code>sep</code> is non NULL, then namespace processing is enabled in the created parser and the character pointed at by sep is used as the separator between -the namespace URI and the local part of the name</p> -<div class="eg"><pre> -typedef struct { - void *(*malloc_fcn)(size_t size); - void *(*realloc_fcn)(void *ptr, size_t size); - void (*free_fcn)(void *ptr); -} XML_Memory_Handling_Suite; -</pre></div> +the namespace URI and the local part of the name.</p> </div> -<div class="fcndec"><a name="XML_ExternalEntityParserCreate"><pre> +<pre class="fcndec" id="XML_ExternalEntityParserCreate"> XML_Parser XML_ExternalEntityParserCreate(XML_Parser p, const XML_Char *context, - const XML_Char *encoding) -</pre></a></div> + const XML_Char *encoding); +</pre> <div class="fcndef"> -Construct a new XML_Parser object for parsing an external general -entity. Context is the context argument passed in a call to a -ExternalEntityRefHandler. Other state information such as handlers, user data, -namespace processing is inherited from the parser passed as the 1st -argument. So you shouldn't need to call any of the behavior changing -functions on this parser (unless you want it to act differently than the -parent parser.) +Construct a new <code>XML_Parser</code> object for parsing an external +general entity. Context is the context argument passed in a call to a +ExternalEntityRefHandler. Other state information such as handlers, +user data, namespace processing is inherited from the parser passed as +the 1st argument. So you shouldn't need to call any of the behavior +changing functions on this parser (unless you want it to act +differently than the parent parser). </div> -<div class="fcndec"><a name="XML_ParserFree"><pre> +<pre class="fcndec" id="XML_ParserFree"> void -XML_ParserFree(XML_Parser p) -</pre></a></div> +XML_ParserFree(XML_Parser p); +</pre> <div class="fcndef"> Free memory used by the parser. Your application is responsible for -freeing any memory associated with <a href="#userdata">UserData</a>. +freeing any memory associated with <a href="#userdata">user data</a>. </div> -<h3><a name="parsing">Parsing</a></h3> +<pre class="fcndec" id="XML_ParserReset"> +XML_Bool +XML_ParserReset(XML_Parser p); +</pre> +<div class="fcndef"> +Clean up the memory structures maintained by the parser so that it may +be used again. After this has been called, <code>parser</code> is +ready to start parsing a new document. This function may not be used +on a parser created using <code><a href= +"#XML_ExternalEntityParserCreate" >XML_ExternalEntityParserCreate</a +></code>; it will return <code>XML_FALSE</code> in that case. Returns +<code>XML_TRUE</code> on success. Your application is responsible for +dealing with any memory associated with <a href="#userdata">user data</a>. +</div> +<h3><a name="parsing">Parsing</a></h3> -<div class="fcndec"><a name="XML_Parse"><pre> -int +<p>To state the obvious: the three parsing functions <code><a href= +"#XML_Parse" >XML_Parse</a></code>, <code><a href= "#XML_ParseBuffer" +>XML_ParseBuffer</a></code> and <code><a href= "#XML_GetBuffer" +>>XML_GetBuffer</a></code> must not be +called from within a handler unless they operate on a separate parser +instance, that is, one that did not call the handler. For example, it +is OK to call the parsing functions from within an +<code>XML_ExternalEntityRefHandler</code>, if they apply to the parser +created by <code><a href= "#XML_ExternalEntityParserCreate" +>XML_ExternalEntityParserCreate</a></code>.</p> + +<pre class="fcndec" id="XML_Parse"> +XML_Status XML_Parse(XML_Parser p, const char *s, int len, - int isFinal) -</pre></a></div> + int isFinal); +</pre> +<pre class="signature"> +enum XML_Status { + XML_STATUS_ERROR = 0, + XML_STATUS_OK = 1 +}; +</pre> <div class="fcndef"> Parse some more of the document. The string <code>s</code> is a buffer containing part (or perhaps all) of the document. The number of bytes of s @@ -657,35 +741,37 @@ memory that <code>s</code> points at, then a memory fault is likely. The <code>isFinal</code> parameter informs the parser that this is the last piece of the document. Frequently, the last piece is empty (i.e. <code>len</code> is zero.) -If a parse error occurred, it returns 0. Otherwise it returns a non-zero -value. +If a parse error occurred, it returns <code>XML_STATUS_ERROR</code>. +Otherwise it returns <code>XML_STATUS_OK</code> value. </div> -<div class="fcndec"><a name="XML_ParseBuffer"><pre> -int +<pre class="fcndec" id="XML_ParseBuffer"> +XML_Status XML_ParseBuffer(XML_Parser p, int len, - int isFinal) -</pre></a></div> + int isFinal); +</pre> <div class="fcndef"> -This is just like XML_Parse, except in this case expat provides the buffer. -By obtaining the buffer from expat with the <code>XML_GetBuffer</code> -function, the application can avoid double copying of the input. +This is just like <code><a href= "#XML_Parse" >XML_Parse</a></code>, +except in this case Expat provides the buffer. By obtaining the +buffer from Expat with the <code><a href= "#XML_GetBuffer" +>XML_GetBuffer</a></code> function, the application can avoid double +copying of the input. </div> -<div class="fcndec"><a name="XML_GetBuffer"><pre> +<pre class="fcndec" id="XML_GetBuffer"> void * XML_GetBuffer(XML_Parser p, - int len) -</pre></a></div> + int len); +</pre> <div class="fcndef"> Obtain a buffer of size <code>len</code> to read a piece of the document -into. A NULL value is returned if expat can't allocate enough memory for +into. A NULL value is returned if Expat can't allocate enough memory for this buffer. This has to be called prior to every call to -<code>XML_ParseBuffer</code>. A typical use would look like this: +<code><a href= "#XML_ParseBuffer" >XML_ParseBuffer</a></code>. A +typical use would look like this: -<div id="eg"> -<pre> +<pre class="eg"> for (;;) { int bytes_read; void *buff = XML_GetBuffer(p, BUFF_SIZE); @@ -694,7 +780,7 @@ for (;;) { } bytes_read = read(docfd, buff, BUFF_SIZE); - if (bytes_read < 0) { + if (bytes_read < 0) { /* handle error */ } @@ -704,40 +790,40 @@ for (;;) { if (bytes_read == 0) break; -} +} </pre> </div> -</div> <h3><a name="setting">Handler Setting</a></h3> + <p>Although handlers are typically set prior to parsing and left alone, an application may choose to set or change the handler for a parsing event while the parse is in progress. For instance, your application may choose to ignore all text not descended from a <code>para</code> element. One way it could do this is to set the character handler when a para start tag -is seen, and unset it for the corresponding end tag. +is seen, and unset it for the corresponding end tag.</p> <p>A handler may be <em>unset</em> by providing a NULL pointer to the appropriate handler setter. None of the handler setting functions have -a return value. +a return value.</p> <p>Your handlers will be receiving strings in arrays of type -<code>XML_Char</code>. This type is defined in expat.h as <code>char *</code> -and contains bytes encoding UTF-8. -Note that you'll receive them in this form independent of the original -encoding of the document.</p> +<code>XML_Char</code>. This type is defined in expat.h as <code>char +*</code> and contains bytes encoding UTF-8. Note that you'll receive +them in this form independent of the original encoding of the +document.</p> <div class="handler"> -<div class="setter"><a name="XML_SetStartElementHandler"><pre> +<pre class="setter" id="XML_SetStartElementHandler"> XML_SetStartElementHandler(XML_Parser p, XML_StartElementHandler start); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_StartElementHandler)(void *userData, const XML_Char *name, const XML_Char **atts); -</pre></div> +</pre> <p>Set handler for start (and empty) tags. Attributes are passed to the start handler as a pointer to a vector of char pointers. Each attribute seen in a start (or empty) tag occupies 2 consecutive places in this vector: the @@ -748,41 +834,41 @@ by a null pointer.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetEndElementHandler"><pre> +<pre class="setter" id="XML_SetEndElementHandler"> XML_SetEndElementHandler(XML_Parser p, XML_EndElementHandler); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_EndElementHandler)(void *userData, const XML_Char *name); -</pre></div> +</pre> <p>Set handler for end (and empty) tags. As noted above, an empty tag generates a call to both start and end handlers.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetElementHandler"><pre> +<pre class="setter" id="XML_SetElementHandler"> XML_SetElementHandler(XML_Parser p, XML_StartElementHandler start, XML_EndElementHandler end); -</pre></a></div> +</pre> <p>Set handlers for start and end tags with one call.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetCharacterDataHandler"><pre> +<pre class="setter" id="XML_SetCharacterDataHandler"> XML_SetCharacterDataHandler(XML_Parser p, XML_CharacterDataHandler charhndl) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_CharacterDataHandler)(void *userData, const XML_Char *s, int len); -</pre></div> +</pre> <p>Set a text handler. The string your handler receives -is <em>NOT zero terminated</em>. You have to use the length argument +is <em>NOT nul-terminated</em>. You have to use the length argument to deal with the end of the string. A single block of contiguous text free of markup may still result in a sequence of calls to this handler. In other words, if you're searching for a pattern in the text, it may @@ -790,199 +876,251 @@ be split across calls to this handler.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetProcessingInstructionHandler"><pre> +<pre class="setter" id="XML_SetProcessingInstructionHandler"> XML_SetProcessingInstructionHandler(XML_Parser p, XML_ProcessingInstructionHandler proc) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_ProcessingInstructionHandler)(void *userData, const XML_Char *target, const XML_Char *data); -</pre></div> +</pre> <p>Set a handler for processing instructions. The target is the first word in the processing instruction. The data is the rest of the characters in it after skipping all whitespace after the initial word.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetCommentHandler"><pre> +<pre class="setter" id="XML_SetCommentHandler"> XML_SetCommentHandler(XML_Parser p, XML_CommentHandler cmnt) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_CommentHandler)(void *userData, const XML_Char *data); -</pre></div> +</pre> <p>Set a handler for comments. The data is all text inside the comment delimiters.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetStartCdataSectionHandler"><pre> +<pre class="setter" id="XML_SetStartCdataSectionHandler"> XML_SetStartCdataSectionHandler(XML_Parser p, XML_StartCdataSectionHandler start); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_StartCdataSectionHandler)(void *userData); -</pre></div> +</pre> <p>Set a handler that gets called at the beginning of a CDATA section.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetEndCdataSectionHandler"><pre> +<pre class="setter" id="XML_SetEndCdataSectionHandler"> XML_SetEndCdataSectionHandler(XML_Parser p, XML_EndCdataSectionHandler end); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_EndCdataSectionHandler)(void *userData); -</pre></div> +</pre> <p>Set a handler that gets called at the end of a CDATA section.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetCdataSectionHandler"><pre> +<pre class="setter" id="XML_SetCdataSectionHandler"> XML_SetCdataSectionHandler(XML_Parser p, XML_StartCdataSectionHandler start, XML_EndCdataSectionHandler end) -</pre></a></div> +</pre> <p>Sets both CDATA section handlers with one call.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetDefaultHandler"><pre> +<pre class="setter" id="XML_SetDefaultHandler"> XML_SetDefaultHandler(XML_Parser p, XML_DefaultHandler hndl) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_DefaultHandler)(void *userData, const XML_Char *s, int len); -</pre></div> +</pre> + <p>Sets a handler for any characters in the document which wouldn't -otherwise be handled. This includes both data for which no handlers can be -set (like some kinds of DTD declarations) and data which could be reported -but which currently has no handler set. Note that a contiguous piece of -data that is destined to be reported to the default handler may actually -be reported over several calls to the handler. Setting the handler with +otherwise be handled. This includes both data for which no handlers +can be set (like some kinds of DTD declarations) and data which could +be reported but which currently has no handler set. The characters +are passed exactly as they were present in the XML document except +that they will be encoded in UTF-8 or UTF-16. Line boundaries are not +normalized. Note that a byte order mark character is not passed to the +default handler. There are no guarantees about how characters are +divided between calls to the default handler: for example, a comment +might be split between multiple calls. Setting the handler with this call has the side effect of turning off expansion of references to internally defined general entities. Instead these references are passed to the default handler.</p> + +<p>See also <code><a +href="#XML_DefaultCurrent">XML_DefaultCurrent</a></code>.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetDefaultHandlerExpand"><pre> +<pre class="setter" id="XML_SetDefaultHandlerExpand"> XML_SetDefaultHandlerExpand(XML_Parser p, XML_DefaultHandler hndl) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_DefaultHandler)(void *userData, const XML_Char *s, int len); -</pre></div> -<p>This sets a default handler, but doesn't affect expansion of internal -entity references.</p> +</pre> +<p>This sets a default handler, but doesn't inhibit the expansion of +internal entity references. The entity reference will not be passed +to the default handler.</p> + +<p>See also <code><a +href="#XML_DefaultCurrent">XML_DefaultCurrent</a></code>.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetExternalEntityRefHandler"><pre> +<pre class="setter" id="XML_SetExternalEntityRefHandler"> XML_SetExternalEntityRefHandler(XML_Parser p, XML_ExternalEntityRefHandler hndl) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef int (*XML_ExternalEntityRefHandler)(XML_Parser p, const XML_Char *context, const XML_Char *base, const XML_Char *systemId, const XML_Char *publicId); -</pre></div> +</pre> <p>Set an external entity reference handler. This handler is also called for processing an external DTD subset if parameter entity parsing is in effect. (See <a href="#XML_SetParamEntityParsing"> <code>XML_SetParamEntityParsing</code></a>.)</p> - -<p>The base parameter is the base to use for relative system identifiers. -It is set by <a href="#XML_SetBase">XML_SetBase</a> and may be null. The -public id parameter is the public id given in the entity declaration and -may be null. The system id is the system identifier specified in the entity -declaration and is never null.</p> - -<p>There are a couple of ways in which this handler differs from others. -First, this handler returns an integer. A non-zero value should be returned -for successful handling of the external entity reference. Returning a zero -indicates failure, and causes the calling parser to return -an <code>XML_ERROR_EXTERNAL_ENTITY_HANDLING</code> error.</p> - -<p>Second, instead of having userData as its first argument, it receives the -parser that encountered the entity reference. This, along with the context -parameter, may be used as arguments to a call to -<a href="#XML_ExternalEntityParserCreate">XML_ExternalEntityParserCreate</a>. -Using the returned parser, the body of the external entity can be recursively -parsed.</p> +<p>The <code>context</code> parameter specifies the parsing context in +the format expected by the <code>context</code> argument to <code><a +href="#XML_ExternalEntityParserCreate" +>XML_ExternalEntityParserCreate</a></code>. <code>code</code> is +valid only until the handler returns, so if the referenced entity is +to be parsed later, it must be copied. <code>context</code> is NULL +only when the entity is a parameter entity, which is how one can +differentiate between general and parameter entities.</p> + +<p>The <code>base</code> parameter is the base to use for relative +system identifiers. It is set by <code><a +href="#XML_SetBase">XML_SetBase</a></code> and may be NULL. The +<code>publicId</code> parameter is the public id given in the entity +declaration and may be NULL. <code>systemId</code> is the system +identifier specified in the entity declaration and is never NULL.</p> + +<p>There are a couple of ways in which this handler differs from +others. First, this handler returns a status indicator (an +integer). <code>XML_STATUS_OK</code> should be returned for successful +handling of the external entity reference. Returning +<code>XML_STATUS_ERROR</code> indicates failure, and causes the +calling parser to return an +<code>XML_ERROR_EXTERNAL_ENTITY_HANDLING</code> error.</p> + +<p>Second, instead of having the user data as its first argument, it +receives the parser that encountered the entity reference. This, along +with the context parameter, may be used as arguments to a call to +<code><a href= "#XML_ExternalEntityParserCreate" +>XML_ExternalEntityParserCreate</a></code>. Using the returned +parser, the body of the external entity can be recursively parsed.</p> <p>Since this handler may be called recursively, it should not be saving information into global or static variables.</p> </div> +<pre class="fcndec" id="XML_SetExternalEntityRefHandlerArg"> +XML_SetExternalEntityRefHandlerArg(XML_Parser p, + void *arg) +</pre> +<div class="fcndef"> +<p>Set the argument passed to the ExternalEntityRefHandler. If +<code>arg</code> is not NULL, it is the new value passed to the +handler set using <code><a href="#XML_SetExternalEntityRefHandler" +>XML_SetExternalEntityRefHandler</a></code>; if <code>arg</code> is +NULL, the argument passed to the handler function will be the parser +object itself.</p> + +<p><strong>Note:</strong> +The type of <code>arg</code> and the type of the first argument to the +ExternalEntityRefHandler do not match. This function takes a +<code>void *</code> to be passed to the handler, while the handler +accepts an <code>XML_Parser</code>. This is a historical accident, +but will not be corrected before Expat 2.0 (at the earliest) to avoid +causing compiler warnings for code that's known to work with this +API. It is the responsibility of the application code to know the +actual type of the argument passed to the handler and to manage it +properly.</p> +</div> + <div class="handler"> -<div class="setter"><a name="XML_SetSkippedEntityHandler"><pre> +<pre class="setter" id="XML_SetSkippedEntityHandler"> XML_SetSkippedEntityHandler(XML_Parser p, XML_SkippedEntityHandler handler) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_SkippedEntityHandler)(void *userData, const XML_Char *entityName, int is_parameter_entity); -</pre></div> +</pre> <p>Set a skipped entity handler. This is called in two situations:</p> <ol> <li>An entity reference is encountered for which no declaration - has been read *and* this is not an error.</li> + has been read <em>and</em> this is not an error.</li> <li>An internal entity reference is read, but not expanded, because <a href="#XML_SetDefaultHandler"><code>XML_SetDefaultHandler</code></a> has been called.</li> </ol> <p>The <code>is_parameter_entity</code> argument will be non-zero for -a parameter entity and zero for a general entity.</p> -<p>Note: skipped parameter entities in declarations and skipped general -entities in attribute values cannot be reported, because the event would -be out of sync with the reporting of the declarations or attribute values</p> +a parameter entity and zero for a general entity.</p> <p>Note: skipped +parameter entities in declarations and skipped general entities in +attribute values cannot be reported, because the event would be out of +sync with the reporting of the declarations or attribute values</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetUnknownEncodingHandler"><pre> +<pre class="setter" id="XML_SetUnknownEncodingHandler"> XML_SetUnknownEncodingHandler(XML_Parser p, XML_UnknownEncodingHandler enchandler, - void *encodingHandlerData) -</pre></a></div> -<div class="signature"><pre> + void *encodingHandlerData) +</pre> +<pre class="signature"> typedef int (*XML_UnknownEncodingHandler)(void *encodingHandlerData, const XML_Char *name, XML_Encoding *info); -</pre></div> -<p>Set a handler to deal with encodings other than the -<a href="#builtin_encodings">built in set</a>. If the handler knows how -to deal with an encoding with the given name, it should fill in the info -data structure and return 1. Otherwise it should return 0.</p> -<pre> - typedef struct { - int map[256]; - void *data; - int (*convert)(void *data, const char *s); - void (*release)(void *data); - } XML_Encoding; +typedef struct { + int map[256]; + void *data; + int (*convert)(void *data, const char *s); + void (*release)(void *data); +} XML_Encoding; </pre> +<p>Set a handler to deal with encodings other than the <a +href="#builtin_encodings">built in set</a>. This should be done before +<code><a href= "#XML_Parse" >XML_Parse</a></code> or <code><a href= +"#XML_ParseBuffer" >XML_ParseBuffer</a></code> have been called on the +given parser.</p> <p>If the handler knows how to deal with an encoding +with the given name, it should fill in the <code>info</code> data +structure and return <code>XML_STATUS_ERROR</code>. Otherwise it +should return <code>XML_STATUS_OK</code>. The handler will be called +at most once per parsed (external) entity. The optional application +data pointer <code>encodingHandlerData</code> will be passed back to +the handler.</p> <p>The map array contains information for every possible possible leading byte in a byte sequence. If the corresponding value is >= 0, then it's @@ -993,89 +1131,110 @@ bytes in the sequence and the actual conversion is accomplished by a call to the function pointed at by convert. This function may return -1 if the sequence itself is invalid. The convert pointer may be null if there are only single byte codes. The data parameter passed to the convert -function is the data pointer from XML_Encoding. The string s is <em>NOT</em> -null terminated and points at the sequence of bytes to be converted.</p> +function is the data pointer from <code>XML_Encoding</code>. The +string s is <em>NOT</em> nul-terminated and points at the sequence of +bytes to be converted.</p> -<p>The function pointed at by release is called by the parser when it is -finished with the encoding. It may be null.</p> +<p>The function pointed at by <code>release</code> is called by the +parser when it is finished with the encoding. It may be NULL.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetStartNamespaceDeclHandler"><pre> +<pre class="setter" id="XML_SetStartNamespaceDeclHandler"> XML_SetStartNamespaceDeclHandler(XML_Parser p, XML_StartNamespaceDeclHandler start); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_StartNamespaceDeclHandler)(void *userData, const XML_Char *prefix, const XML_Char *uri); -</pre></div> +</pre> <p>Set a handler to be called when a namespace is declared. Namespace declarations occur inside start tags. But the namespace declaration start handler is called before the start tag handler for each namespace declared in that start tag.</p> + +<p><strong>Note:</strong> +Due to limitations of the implementation, the +StartNamespaceDeclHandler is not called unless the StartElementHandler +is also set. The specific value of the StartElementHandler is allowed +to change freely, so long as it is not NULL.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetEndNamespaceDeclHandler"><pre> +<pre class="setter" id="XML_SetEndNamespaceDeclHandler"> XML_SetEndNamespaceDeclHandler(XML_Parser p, XML_EndNamespaceDeclHandler end); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_EndNamespaceDeclHandler)(void *userData, const XML_Char *prefix); -</pre></div> +</pre> <p>Set a handler to be called when leaving the scope of a namespace -declaration. This will be called, for each namespace declaration, after -the handler for the end tag of the element in which the namespace was declared. -</p> +declaration. This will be called, for each namespace declaration, +after the handler for the end tag of the element in which the +namespace was declared.</p> + +<p><strong>Note:</strong> +Due to limitations of the implementation, the EndNamespaceDeclHandler +is not called unless the StartElementHandler is also set. The +specific value of the StartElementHandler is allowed to change freely, +so long as it is not NULL.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetNamespaceDeclHandler"><pre> +<pre class="setter" id="XML_SetNamespaceDeclHandler"> XML_SetNamespaceDeclHandler(XML_Parser p, XML_StartNamespaceDeclHandler start, XML_EndNamespaceDeclHandler end) -</pre></a></div> -<p>Sets both namespace declaration handlers with a single call</p> +</pre> +<p>Sets both namespace declaration handlers with a single call.</p> + +<p><strong>Note:</strong> +Due to limitations of the implementation, the +StartNamespaceDeclHandler and EndNamespaceDeclHandler are not called +unless the StartElementHandler is also set. The specific value of the +StartElementHandler is allowed to change freely, so long as it is not +NULL.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetXmlDeclHandler"><pre> +<pre class="setter" id="XML_SetXmlDeclHandler"> XML_SetXmlDeclHandler(XML_Parser p, XML_XmlDeclHandler xmldecl); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_XmlDeclHandler) (void *userData, const XML_Char *version, const XML_Char *encoding, int standalone); -</pre></div> +</pre> <p>Sets a handler that is called for XML declarations and also for -text declarations discovered in external entities. The way to distinguish -is that the <code>version</code> parameter will be NULL for text -declarations. The <code>encoding</code> parameter may be NULL for -an XML declaration. The <code>standalone</code> argument will contain --1, 0, or 1 indicating respectively that there was no standalone parameter in -the declaration, that it was given as no, or that it was given as yes.</p> +text declarations discovered in external entities. The way to +distinguish is that the <code>version</code> parameter will be NULL +for text declarations. The <code>encoding</code> parameter may be NULL +for an XML declaration. The <code>standalone</code> argument will +contain -1, 0, or 1 indicating respectively that there was no +standalone parameter in the declaration, that it was given as no, or +that it was given as yes.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetStartDoctypeDeclHandler"><pre> +<pre class="setter" id="XML_SetStartDoctypeDeclHandler"> XML_SetStartDoctypeDeclHandler(XML_Parser p, XML_StartDoctypeDeclHandler start); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_StartDoctypeDeclHandler)(void *userData, const XML_Char *doctypeName, const XML_Char *sysid, const XML_Char *pubid, int has_internal_subset); -</pre></div> +</pre> <p>Set a handler that is called at the start of a DOCTYPE declaration, before any external or internal subset is parsed. Both <code>sysid</code> and <code>pubid</code> may be NULL. The <code>has_internal_subset</code> @@ -1083,39 +1242,39 @@ will be non-zero if the DOCTYPE declaration has an internal subset.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetEndDoctypeDeclHandler"><pre> +<pre class="setter" id="XML_SetEndDoctypeDeclHandler"> XML_SetEndDoctypeDeclHandler(XML_Parser p, XML_EndDoctypeDeclHandler end); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_EndDoctypeDeclHandler)(void *userData); -</pre></div> +</pre> <p>Set a handler that is called at the end of a DOCTYPE declaration, after parsing any external subset.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetDoctypeDeclHandler"><pre> +<pre class="setter" id="XML_SetDoctypeDeclHandler"> XML_SetDoctypeDeclHandler(XML_Parser p, XML_StartDoctypeDeclHandler start, XML_EndDoctypeDeclHandler end); -</pre></a></div> +</pre> <p>Set both doctype handlers with one call.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetElementDeclHandler"><pre> +<pre class="setter" id="XML_SetElementDeclHandler"> XML_SetElementDeclHandler(XML_Parser p, XML_ElementDeclHandler eldecl); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_ElementDeclHandler)(void *userData, const XML_Char *name, XML_Content *model); -</pre></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> enum XML_Content_Type { XML_CTYPE_EMPTY = 1, XML_CTYPE_ANY, @@ -1141,42 +1300,46 @@ struct XML_cp { unsigned int numchildren; XML_Content * children; }; -</pre></div> -<p>Sets a handler for element declarations in a DTD. The handler gets called -with the name of the element in the declaration and a pointer to a structure -that contains the element model. It is the application's responsibility to -free this data structure.</p> +</pre> +<p>Sets a handler for element declarations in a DTD. The handler gets +called with the name of the element in the declaration and a pointer +to a structure that contains the element model. It is the +application's responsibility to free this data structure using +<code><a href="#XML_FreeContentModel" +>XML_FreeContentModel</a></code>.</p> <p>The <code>model</code> argument is the root of a tree of <code>XML_Content</code> nodes. If <code>type</code> equals <code>XML_CTYPE_EMPTY</code> or <code>XML_CTYPE_ANY</code>, then -<code>quant</code> will be <code>XML_CQUANT_NONE</code>, and the other fields -will be zero or NULL. -If <code>type</code> is <code>XML_CTYPE_MIXED</code>, then <code>quant</code> -will be <code>XML_CQUANT_NONE</code> or <code>XML_CQUANT_REP</code> and -<code>numchildren</code> will contain the number of elements that are allowed -to be mixed in and <code>children</code> points to an array of -<code>XML_Content</code> structures that will all have type XML_CTYPE_NAME -with no quantification. -Only the root node can be type <code>XML_CTYPE_EMPTY</code>, <code>XML_CTYPE_ANY</code>, or <code>XML_CTYPE_MIXED</code>.</p> - -<p>For type <code>XML_CTYPE_NAME</code>, the <code>name</code> field points -to the name and the <code>numchildren</code> and <code>children</code> fields -will be zero and NULL. The <code>quant</code> field will indicate any -quantifiers placed on the name.</p> +<code>quant</code> will be <code>XML_CQUANT_NONE</code>, and the other +fields will be zero or NULL. If <code>type</code> is +<code>XML_CTYPE_MIXED</code>, then <code>quant</code> will be +<code>XML_CQUANT_NONE</code> or <code>XML_CQUANT_REP</code> and +<code>numchildren</code> will contain the number of elements that are +allowed to be mixed in and <code>children</code> points to an array of +<code>XML_Content</code> structures that will all have type +XML_CTYPE_NAME with no quantification. Only the root node can be type +<code>XML_CTYPE_EMPTY</code>, <code>XML_CTYPE_ANY</code>, or +<code>XML_CTYPE_MIXED</code>.</p> + +<p>For type <code>XML_CTYPE_NAME</code>, the <code>name</code> field +points to the name and the <code>numchildren</code> and +<code>children</code> fields will be zero and NULL. The +<code>quant</code> field will indicate any quantifiers placed on the +name.</p> <p>Types <code>XML_CTYPE_CHOICE</code> and <code>XML_CTYPE_SEQ</code> -indicate a choice or sequence respectively. The <code>numchildren</code> -field indicates how many nodes in the choice or sequence and -<code>children</code> points to the nodes.</p> +indicate a choice or sequence respectively. The +<code>numchildren</code> field indicates how many nodes in the choice +or sequence and <code>children</code> points to the nodes.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetAttlistDeclHandler"><pre> +<pre class="setter" id="XML_SetAttlistDeclHandler"> XML_SetAttlistDeclHandler(XML_Parser p, XML_AttlistDeclHandler attdecl); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_AttlistDeclHandler) (void *userData, const XML_Char *elname, @@ -1184,32 +1347,31 @@ typedef void const XML_Char *att_type, const XML_Char *dflt, int isrequired); -</pre></div> -<p>Set a handler for attlist declarations in the DTD. This handler is called -for <em>each</em> attribute. So a single attlist declaration with multiple -attributes declared will generate multiple calls to this handler. The -<code>elname</code> parameter returns the name of the element for which the -attribute is being declared. The attribute name is in the <code>attname</code> -parameter. The attribute type is in the <code>att_type</code> parameter. -It is the string representing the type in the declaration with whitespace -removed.</p> - -<p>The <code>dflt</code> parameter holds the default value. It will -be NULL in the case of "#IMPLIED" or "#REQUIRED" attributes. You can +</pre> +<p>Set a handler for attlist declarations in the DTD. This handler is +called for <em>each</em> attribute. So a single attlist declaration +with multiple attributes declared will generate multiple calls to this +handler. The <code>elname</code> parameter returns the name of the +element for which the attribute is being declared. The attribute name +is in the <code>attname</code> parameter. The attribute type is in the +<code>att_type</code> parameter. It is the string representing the +type in the declaration with whitespace removed.</p> + +<p>The <code>dflt</code> parameter holds the default value. It will be +NULL in the case of "#IMPLIED" or "#REQUIRED" attributes. You can distinguish these two cases by checking the <code>isrequired</code> parameter, which will be true in the case of "#REQUIRED" attributes. Attributes which are "#FIXED" will have also have a true -<code>isrequired</code>, but they will have the non-NULL fixed value in the -<code>dflt</code> parameter. -</p> +<code>isrequired</code>, but they will have the non-NULL fixed value +in the <code>dflt</code> parameter.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetEntityDeclHandler"><pre> +<pre class="setter" id="XML_SetEntityDeclHandler"> XML_SetEntityDeclHandler(XML_Parser p, XML_EntityDeclHandler handler); -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_EntityDeclHandler) (void *userData, const XML_Char *entityName, @@ -1220,28 +1382,29 @@ typedef void const XML_Char *systemId, const XML_Char *publicId, const XML_Char *notationName); -</pre></div> +</pre> <p>Sets a handler that will be called for all entity declarations. -The <code>is_parameter_entity</code> argument will be non-zero in the case -of parameter entities and zero otherwise. -</p> +The <code>is_parameter_entity</code> argument will be non-zero in the +case of parameter entities and zero otherwise.</p> + <p>For internal entities (<code><!ENTITY foo "bar"></code>), <code>value</code> will be non-NULL and <code>systemId</code>, <code>publicId</code>, and <code>notationName</code> will all be NULL. -The value string is <em>not</em> NULL terminated; the length is provided in -the <code>value_length</code> parameter. Do not use <code>value_length</code> -to test for internal entities, since it is legal to have zero-length -values. Instead check for whether or not <code>value</code> is NULL.</p> -<p>The <code>notationName</code> argument will have a non-NULL value only -for unparsed entity declarations.</p> +The value string is <em>not</em> NULL terminated; the length is +provided in the <code>value_length</code> parameter. Do not use +<code>value_length</code> to test for internal entities, since it is +legal to have zero-length values. Instead check for whether or not +<code>value</code> is NULL.</p> <p>The <code>notationName</code> +argument will have a non-NULL value only for unparsed entity +declarations.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetUnparsedEntityDeclHandler"><pre> +<pre class="setter" id="XML_SetUnparsedEntityDeclHandler"> XML_SetUnparsedEntityDeclHandler(XML_Parser p, XML_UnparsedEntityDeclHandler h) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_UnparsedEntityDeclHandler)(void *userData, const XML_Char *entityName, @@ -1249,109 +1412,112 @@ typedef void const XML_Char *systemId, const XML_Char *publicId, const XML_Char *notationName); -</pre></div> +</pre> <p>Set a handler that receives declarations of unparsed entities. These are entity declarations that have a notation (NDATA) field:</p> <div id="eg"><pre> <!ENTITY logo SYSTEM "images/logo.gif" NDATA gif> </pre></div> - -<p>This handler is obsolete and is provided for backwards compatibility. -Use instead <a href="#XML_SetEntityDeclHandler">XML_SetEntityDeclHandler</a>. -</p> +<p>This handler is obsolete and is provided for backwards +compatibility. Use instead <a href= "#XML_SetEntityDeclHandler" +>XML_SetEntityDeclHandler</a>.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetNotationDeclHandler"><pre> +<pre class="setter" id="XML_SetNotationDeclHandler"> XML_SetNotationDeclHandler(XML_Parser p, XML_NotationDeclHandler h) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef void (*XML_NotationDeclHandler)(void *userData, const XML_Char *notationName, const XML_Char *base, const XML_Char *systemId, const XML_Char *publicId); -</pre></div> +</pre> <p>Set a handler that receives notation declarations.</p> </div> <div class="handler"> -<div class="setter"><a name="XML_SetNotStandaloneHandler"><pre> +<pre class="setter" id="XML_SetNotStandaloneHandler"> XML_SetNotStandaloneHandler(XML_Parser p, XML_NotStandaloneHandler h) -</pre></a></div> -<div class="signature"><pre> +</pre> +<pre class="signature"> typedef int (*XML_NotStandaloneHandler)(void *userData); -</pre></div> +</pre> <p>Set a handler that is called if the document is not "standalone". -This happens when there is an external subset or a reference to a parameter -entity, but does not have standalone set to "yes" in an XML declaration. -If this handler returns 0, then the parser will throw an -<code>XML_ERROR_NOT_STANDALONE</code> error.</p> +This happens when there is an external subset or a reference to a +parameter entity, but does not have standalone set to "yes" in an XML +declaration. If this handler returns <code>XML_STATUS_ERROR</code>, +then the parser will throw an <code>XML_ERROR_NOT_STANDALONE</code> +error.</p> </div> <h3><a name="position">Parse position and error reporting functions</a></h3> -<p>These are the functions you'll want to call when the parse functions -return 0 (i.e. a parse error has ocurred), although the position reporting -functions are useful outside of errors. The position reported is the byte -position (in the original document or entity encoding) of the first of the -sequence of characters that generated the current event (or the error that -caused the parse functions to return 0.)</p> -<p>The position reporting functions are accurate only outside of the DTD. -In other words, they usually return bogus information when called from within -a DTD declaration handler.</p> - -<div class="fcndec"><a name="XML_GetErrorCode"><pre> + +<p>These are the functions you'll want to call when the parse +functions return <code>XML_STATUS_ERROR</code> (a parse error has +ocurred), although the position reporting functions are useful outside +of errors. The position reported is the byte position (in the original +document or entity encoding) of the first of the sequence of +characters that generated the current event (or the error that caused +the parse functions to return <code>XML_STATUS_ERROR</code>.)</p> + +<p>The position reporting functions are accurate only outside of the +DTD. In other words, they usually return bogus information when +called from within a DTD declaration handler.</p> + +<pre class="fcndec" id="XML_GetErrorCode"> enum XML_Error -XML_GetErrorCode(XML_Parser p) -</pre></a></div> +XML_GetErrorCode(XML_Parser p); +</pre> <div class="fcndef"> Return what type of error has occurred. </div> -<div class="fcndec"><a name="XML_ErrorString"><pre> +<pre class="fcndec" id="XML_ErrorString"> const XML_LChar * -XML_ErrorString(int code) -</pre></a></div> +XML_ErrorString(int code); +</pre> <div class="fcndef"> Return a string describing the error corresponding to code. The code should be one of the enums that can be returned from -XML_GetErrorCode. +<code><a href= "#XML_GetErrorCode" >XML_GetErrorCode</a></code>. </div> -<div class="fcndec"><a name="XML_GetCurrentByteIndex"><pre> +<pre class="fcndec" id="XML_GetCurrentByteIndex"> long -XML_GetCurrentByteIndex(XML_Parser p) -</pre></a></div> +XML_GetCurrentByteIndex(XML_Parser p); +</pre> <div class="fcndef"> Return the byte offset of the position. </div> -<div class="fcndec"><a name="XML_GetCurrentLineNumber"><pre> +<pre class="fcndec" id="XML_GetCurrentLineNumber"> int -XML_GetCurrentLineNumber(XML_Parser p) -</pre></a></div> +XML_GetCurrentLineNumber(XML_Parser p); +</pre> <div class="fcndef"> Return the line number of the position. </div> -<div class="fcndec"><a name="XML_GetCurrentColumnNumber"><pre> +<pre class="fcndec" id="XML_GetCurrentColumnNumber"> int -XML_GetCurrentColumnNumber(XML_Parser p) -</pre></a></div> +XML_GetCurrentColumnNumber(XML_Parser p); +</pre> <div class="fcndef"> Return the offset, from the beginning of the current line, of the position. </div> -<div class="fcndec"><a name="XML_GetCurrentByteCount"><pre> +<pre class="fcndec" id="XML_GetCurrentByteCount"> int XML_GetCurrentByteCount(XML_Parser p); -</pre></a></div> +</pre> <div class="fcndef"> Return the number of bytes in the current event. Returns <code>0</code> if the event is inside a reference to an internal @@ -1360,125 +1526,137 @@ be used to distinguish empty-element tags from empty elements using separate start and end tags). </div> -<div class="fcndec"><a name="XML_GetInputContext"><pre> +<pre class="fcndec" id="XML_GetInputContext"> const char * XML_GetInputContext(XML_Parser p, int *offset, int *size); -</pre></a></div> +</pre> <div class="fcndef"> + <p>Returns the parser's input buffer, sets the integer pointed at by <code>offset</code> to the offset within this buffer of the current -parse position, and set the integer pointed at by <code>size</code> -to the size of the returned buffer.</p> +parse position, and set the integer pointed at by <code>size</code> to +the size of the returned buffer.</p> + <p>This should only be called from within a handler during an active parse and the returned buffer should only be referred to from within -the handler that made the call. This input buffer contains the untranslated -bytes of the input.</p> -<p>Only a limited amount of context is kept, so if the event triggering -a call spans over a very large amount of input, the actual parse position -may be before the beginning of the buffer.</p> +the handler that made the call. This input buffer contains the +untranslated bytes of the input.</p> + +<p>Only a limited amount of context is kept, so if the event +triggering a call spans over a very large amount of input, the actual +parse position may be before the beginning of the buffer.</p> </div> <h3><a name="miscellaneous">Miscellaneous functions</a></h3> -<p>The functions in this section either obtain state information from the -parser or can be used to dynamicly set parser options. -<div class="fcndec"><a name="XML_SetUserData"><pre> +<p>The functions in this section either obtain state information from +the parser or can be used to dynamicly set parser options.</p> + +<pre class="fcndec" id="XML_SetUserData"> void XML_SetUserData(XML_Parser p, - void *userData) -</pre></a></div> + void *userData); +</pre> <div class="fcndef"> -This sets the user data pointer that gets passed to handlers. -It overwrites any previous value for this pointer. Note that the +This sets the user data pointer that gets passed to handlers. It +overwrites any previous value for this pointer. Note that the application is responsible for freeing the memory associated with -<code>userData</code> when it is finished with the parser. So if -you call this when there's already a pointer there, and you haven't -freed the memory associated with it, then you've probably just leaked +<code>userData</code> when it is finished with the parser. So if you +call this when there's already a pointer there, and you haven't freed +the memory associated with it, then you've probably just leaked memory. </div> -<div class="fcndec"><a name="XML_GetUserData"><pre> +<pre class="fcndec" id="XML_GetUserData"> void * -XML_GetUserData(XML_Parser p) -</pre></a></div> +XML_GetUserData(XML_Parser p); +</pre> <div class="fcndef"> This returns the user data pointer that gets passed to handlers. It is actually implemented as a macro. </div> -<div class="fcndec"><a name="XML_UseParserAsHandlerArg"><pre> +<pre class="fcndec" id="XML_UseParserAsHandlerArg"> void -XML_UseParserAsHandlerArg(XML_Parser p) -</pre></a></div> +XML_UseParserAsHandlerArg(XML_Parser p); +</pre> <div class="fcndef"> -After this is called, handlers receive the parser in the -userData argument. The userData information can still be obtained using -the XML_GetUserData function. +After this is called, handlers receive the parser in their +<code>userData</code> arguments. The user data can still be obtained +using the <code><a href= "#XML_GetUserData" +>XML_GetUserData</a></code> function. </div> -<div class="fcndec"><a name="XML_SetBase"><pre> -int +<pre class="fcndec" id="XML_SetBase"> +enum XML_Status XML_SetBase(XML_Parser p, - const XML_Char *base) -</pre></a></div> + const XML_Char *base); +</pre> <div class="fcndef"> -Set the base to be used for resolving relative URIs in system identifiers. -The return value is 0 if there's no memory to store base, otherwise it's -non-zero. +Set the base to be used for resolving relative URIs in system +identifiers. The return value is <code>XML_STATUS_ERROR</code> if +there's no memory to store base, otherwise it's +<code>XML_STATUS_OK</code>. </div> -<div class="fcndec"><a name="XML_GetBase"><pre> +<pre class="fcndec" id="XML_GetBase"> const XML_Char * -XML_GetBase(XML_Parser p) -</pre></a></div> +XML_GetBase(XML_Parser p); +</pre> <div class="fcndef"> Return the base for resolving relative URIs. </div> -<div class="fcndec"><a name="XML_GetSpecifiedAttributeCount"><pre> +<pre class="fcndec" id="XML_GetSpecifiedAttributeCount"> int -XML_GetSpecifiedAttributeCount(XML_Parser p) -</pre></a></div> +XML_GetSpecifiedAttributeCount(XML_Parser p); +</pre> <div class="fcndef"> When attributes are reported to the start handler in the atts vector, attributes that were explicitly set in the element occur before any attributes that receive their value from default information in an -ATTLIST declaration. This function returns the number of attributes that -were explicitly set times two, thus giving the offset in the <code>atts</code> -array passed to the start tag handler of the first attribute set -due to defaults. It supplies information for the last call to a start -handler. If called inside a start handler, then that means the current call. +ATTLIST declaration. This function returns the number of attributes +that were explicitly set times two, thus giving the offset in the +<code>atts</code> array passed to the start tag handler of the first +attribute set due to defaults. It supplies information for the last +call to a start handler. If called inside a start handler, then that +means the current call. </div> -<div class="fcndec"><a name="XML_GetIdAttributeIndex"><pre> +<pre class="fcndec" id="XML_GetIdAttributeIndex"> int XML_GetIdAttributeIndex(XML_Parser p); -</pre></a></div> +</pre> <div class="fcndef"> -Returns the index of the ID attribute passed in the atts array -in the last call to XML_StartElementHandler, or -1 if there is no ID -attribute. If called inside a start handler, then that means the current call. +Returns the index of the ID attribute passed in the atts array in the +last call to <code><a href= "#XML_StartElementHandler" +>XML_StartElementHandler</a></code>, or -1 if there is no ID +attribute. If called inside a start handler, then that means the +current call. </div> -<div class="fcndec"><a name="XML_SetEncoding"><pre> -int +<pre class="fcndec" id="XML_SetEncoding"> +enum XML_Status XML_SetEncoding(XML_Parser p, - const XML_Char *encoding) -</pre></a></div> + const XML_Char *encoding); +</pre> <div class="fcndef"> Set the encoding to be used by the parser. It is equivalent to passing a non-null encoding argument to the parser creation functions. -It must not be called after XML_Parser or XML_ParseBuffer have been -called on the given parser. +It must not be called after <code><a href= "#XML_Parse" +>XML_Parse</a></code> or <code><a href= "#XML_ParseBuffer" +>XML_ParseBuffer</a></code> have been called on the given parser. +Returns <code>XML_STATUS_OK</code> on success or +<code>XML_STATUS_ERROR</code> on error. </div> -<div class="fcndec"><a name="XML_SetParamEntityParsing"><pre> +<pre class="fcndec" id="XML_SetParamEntityParsing"> int XML_SetParamEntityParsing(XML_Parser p, - enum XML_ParamEntityParsing code) -</pre></a></div> + enum XML_ParamEntityParsing code); +</pre> <div class="fcndef"> This enables parsing of parameter entities, including the external parameter entity that is the external DTD subset, according to @@ -1491,47 +1669,95 @@ The choices for <code>code</code> are: </ul> </div> -<div class="fcndec"><a name="XML_SetReturnNSTriplet"><pre> +<pre class="fcndec" id="XML_UseForeignDTD"> +enum XML_Error +XML_UseForeignDTD(XML_Parser parser, XML_Bool useDTD); +</pre> +<div class="fcndef"> +<p>This function allows an application to provide an external subset +for the document type declaration for documents which do not specify +an external subset of their own. For documents which specify an +external subset in their DOCTYPE declaration, the application-provided +subset will be ignored. If the document does not contain a DOCTYPE +declaration at all and <code>useDTD</code> is true, the +application-provided subset will be parsed, but the +<code>startDoctypeDeclHandler</code> and +<code>endDoctypeDeclHandler</code> functions, if set, will not be +called. The setting of parameter entity parsing, controlled using +<code><a href= "#XML_SetParamEntityParsing" +>XML_SetParamEntityParsing</a></code>, will be honored.</p> + +<p>The application-provided external subset is read by calling the +external entity reference handler set via <code><a href= +"#XML_SetExternalEntityRefHandler" +>XML_SetExternalEntityRefHandler</a></code> with both +<code>publicId</code> and <code>systemId</code> set to NULL.</p> + +<p>If this function is called after parsing has begun, it returns +<code>XML_ERROR_CANT_CHANGE_FEATURE_ONCE_PARSING</code> and ignores +<code>useDTD</code>. If called when Expat has been compiled without +DTD support, it returns +<code>XML_ERROR_FEATURE_REQUIRES_XML_DTD</code>. Otherwise, it +returns <code>XML_ERROR_NONE</code>.</p> +</div> + +<pre class="fcndec" id="XML_SetReturnNSTriplet"> void XML_SetReturnNSTriplet(XML_Parser parser, int do_nst); -</pre></a></div> +</pre> <div class="fcndef"> <p> This function only has an effect when using a parser created with -<a href="#XML_ParserCreateNS">XML_ParserCreateNS</a>, i.e. when namespace -processing is in effect. The <code>do_nst</code> sets whether or not prefixes -are returned with names qualified with a namespace prefix. If this function -is called with <code>do_nst</code> non-zero, then afterwards namespace -qualified names (that is qualified with a prefix as opposed to belonging -to a default namespace) are returned as a triplet with the three parts -separated by the namespace separator specified when the parser was created. -The order of returned parts is URI, local name, and prefix.</p> -<p>If <code>do_nst</code> is zero, then namespaces are reported in the -default manner, URI then local_name separated by the namespace separator.</p> +<code><a href= "#XML_ParserCreateNS" >XML_ParserCreateNS</a></code>, +i.e. when namespace processing is in effect. The <code>do_nst</code> +sets whether or not prefixes are returned with names qualified with a +namespace prefix. If this function is called with <code>do_nst</code> +non-zero, then afterwards namespace qualified names (that is qualified +with a prefix as opposed to belonging to a default namespace) are +returned as a triplet with the three parts separated by the namespace +separator specified when the parser was created. The order of +returned parts is URI, local name, and prefix.</p> <p>If +<code>do_nst</code> is zero, then namespaces are reported in the +default manner, URI then local_name separated by the namespace +separator.</p> </div> -<div class="fcndec"><a name="XML_ExpatVersion"><pre> +<pre class="fcndec" id="XML_DefaultCurrent"> +void +XML_DefaultCurrent(XML_Parser parser); +</pre> +<div class="fcndef"> +This can be called within a handler for a start element, end element, +processing instruction or character data. It causes the corresponding +markup to be passed to the default handler set by <code><a +href="#XML_SetDefaultHandler" >XML_SetDefaultHandler</a></code> or +<code><a href="#XML_SetDefaultHandlerExpand" +>XML_SetDefaultHandlerExpand</a></code>. It does nothing if there is +not a default handler. +</div> + +<pre class="fcndec" id="XML_ExpatVersion"> XML_LChar * XML_ExpatVersion(); -</pre></a></div> +</pre> <div class="fcndef"> -Return the library version as a string (e.g. "expat_1.95.1"). +Return the library version as a string (e.g. <code>"expat_1.95.1"</code>). </div> -<div class="fcndec"><a name="XML_ExpatVersionInfo"><pre> -struct XML_expat_version +<pre class="fcndec" id="XML_ExpatVersionInfo"> +struct XML_Expat_Version XML_ExpatVersionInfo(); -</pre></a></div> -<div class="fcndef"> -Return the library version information as a structure. -<div class="eg"><pre> +</pre> +<pre class="signature"> typedef struct { int major; int minor; int micro; } XML_Expat_Version; -</pre></div> +</pre> +<div class="fcndef"> +Return the library version information as a structure. Some macros are also defined that support compile-time tests of the library version: <ul> @@ -1542,7 +1768,129 @@ library version: Testing these constants is currently the best way to determine if particular parts of the Expat API are available. </div> + +<pre class="fcndec" id="XML_GetFeatureList"> +const XML_Feature * +XML_GetFeatureList(); +</pre> +<pre class="signature"> +enum XML_FeatureEnum { + XML_FEATURE_END = 0, + XML_FEATURE_UNICODE, + XML_FEATURE_UNICODE_WCHAR_T, + XML_FEATURE_DTD, + XML_FEATURE_CONTEXT_BYTES, + XML_FEATURE_MIN_SIZE, + XML_FEATURE_SIZEOF_XML_CHAR, + XML_FEATURE_SIZEOF_XML_LCHAR +}; + +typedef struct { + enum XML_FeatureEnum feature; + XML_LChar *name; + long int value; +} XML_Feature; +</pre> +<div class="fcndef"> +<p>Returns a list of "feature" records, providing details on how +Expat was configured at compile time. Most applications should not +need to worry about this, but this information is otherwise not +available from Expat. This function allows code that does need to +check these features to do so at runtime.</p> + +<p>The return value is an array of <code>XML_Feature</code>, +terminated by a record with a <code>feature</code> of +<code>XML_FEATURE_END</code> and <code>name</code> of NULL, +identifying the feature-test macros Expat was compiled with. Since an +application that requires this kind of information needs to determine +the type of character the <code>name</code> points to, records for the +<code>XML_FEATURE_SIZEOF_XML_CHAR</code> and +<code>XML_FEATURE_SIZEOF_XML_LCHAR</code> will be located at the +beginning of the list, followed by <code>XML_FEATURE_UNICODE</code> +and <code>XML_FEATURE_UNICODE_WCHAR_T</code>, if they are present at +all.</p> + +<p>Some features have an associated value. If there isn't an +associated value, the <code>value</code> field is set to 0. At this +time, the following features have been defined to have values:</p> + +<dl> + <dt><code>XML_FEATURE_SIZEOF_XML_CHAR</code></dt> + <dd>The number of bytes occupied by one <code>XML_Char</code> + character.</dd> + <dt><code>XML_FEATURE_SIZEOF_XML_LCHAR</code></dt> + <dd>The number of bytes occupied by one <code>XML_LChar</code> + character.</dd> + <dt><code>XML_FEATURE_CONTEXT_BYTES</code></dt> + <dd>The maximum number of characters of context which can be + reported by <code><a href= "#XML_GetInputContext" + >XML_GetInputContext</a></code>.</dd> </dl> +</div> + +<pre class="fcndec" id="XML_FreeContentModel"> +void +XML_FreeContentModel(XML_Parser parser, XML_Content *model); +</pre> +<div class="fcndef"> +Function to deallocate the <code>model</code> argument passed to the +<code>XML_ElementDeclHandler</code> callback set using <code><a +href="#XML_SetElementDeclHandler" >XML_ElementDeclHandler</a></code>. +This function should not be used for any other purpose. +</div> + +<p>The following functions allow external code to share the memory +allocator an <code>XML_Parser</code> has been configured to use. This +is especially useful for third-party libraries that interact with a +parser object created by application code, or heavily layered +applications. This can be essential when using dynamically loaded +libraries which use different C standard libraries (this can happen on +Windows, at least).</p> + +<pre class="fcndec" id="XML_MemMalloc"> +void * +XML_MemMalloc(XML_Parser parser, size_t size); +</pre> +<div class="fcndef"> +Allocate <code>size</code> bytes of memory using the allocator the +<code>parser</code> object has been configured to use. Returns a +pointer to the memory or NULL on failure. Memory allocated in this +way must be freed using <code><a href="#XML_MemFree" +>XML_MemFree</a></code>. +</div> + +<pre class="fcndec" id="XML_MemRealloc"> +void * +XML_MemRealloc(XML_Parser parser, void *ptr, size_t size); +</pre> +<div class="fcndef"> +Allocate <code>size</code> bytes of memory using the allocator the +<code>parser</code> object has been configured to use. +<code>ptr</code> must point to a block of memory allocated by <code><a +href="#XML_MemMalloc" >XML_MemMalloc</a></code> or +<code>XML_MemRealloc</code>, or be NULL. This function tries to +expand the block pointed to by <code>ptr</code> if possible. Returns +a pointer to the memory or NULL on failure. On success, the original +block has either been expanded or freed. On failure, the original +block has not been freed; the caller is responsible for freeing the +original block. Memory allocated in this way must be freed using +<code><a href="#XML_MemFree" +>XML_MemFree</a></code>. +</div> + +<pre class="fcndec" id="XML_MemFree"> +void +XML_MemFree(XML_Parser parser, void *ptr); +</pre> +<div class="fcndef"> +Free a block of memory pointed to by <code>ptr</code>. The block must +have been allocated by <code><a href="#XML_MemMalloc" +>XML_MemMalloc</a></code> or <code>XML_MemRealloc</code>, or be NULL. +</div> +<hr /> +<p><a href="http://validator.w3.org/check/referer"><img + src="valid-xhtml10.png" alt="Valid XHTML 1.0!" + height="31" width="88" class="noborder" /></a></p> </body> </html> |