Updated introduction, diagrams, revision up to 0.7

8 files changed, 594 insertions, 25 deletions

diff --git a/images/basic_structure.dia b/images/basic_structure.dia
new file mode 100644
index 0000000..0f93414
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diff --git a/images/basic_structure.svg b/images/basic_structure.svg
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+    </text>
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+      <tspan x="276" y="154"></tspan>
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+      <tspan x="286.1" y="294.25">Ytstenut Framework</tspan>
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+      <tspan x="243.4" y="426">Standard data exchange </tspan>
+      <tspan x="243.4" y="442">protocol stack, etc.</tspan>
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+      </text>
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+        <tspan x="811.3" y="294.75">Ytstenut Framework</tspan>
+      </text>
+      <text style="fill: #000000;text-anchor:middle;font-size:12.8;font-family:sanserif;font-style:normal;font-weight:normal" x="768.6" y="426.5">
+        <tspan x="768.6" y="426.5">Standard data exchange </tspan>
+        <tspan x="768.6" y="442.5">protocol stack, etc.</tspan>
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diff --git a/images/cloud_mesh.dia b/images/cloud_mesh.dia
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diff --git a/images/cloud_mesh.svg b/images/cloud_mesh.svg
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+    <path style="fill: none; fill-opacity:0; stroke-width: 0.02; stroke: #003c55" d="M 546.208 235.521 L 546.208,228.816 L 530.39,228.816 L 530.39,222.992 L 521.246,232.152 L 530.39,241.345 L 530.39,235.521 L 546.208,235.521"/>
+  </g>
+  <g>
+    <line style="fill: none; fill-opacity:0; stroke-width: 8; stroke: #a52a2a" x1="575.357" y1="212.515" x2="697.018" y2="283.926"/>
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+    <polygon style="fill: none; fill-opacity:0; stroke-width: 8; stroke: #a52a2a" points="568.889,208.718 580.044,209.468 575.357,212.515 574.982,218.092 "/>
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+    <polygon style="fill: none; fill-opacity:0; stroke-width: 8; stroke: #a52a2a" points="703.486,287.722 692.331,286.972 697.018,283.926 697.393,278.348 "/>
+  </g>
+  <text style="fill: #000000;text-anchor:start;font-size:12.8;font-family:sanserif;font-style:normal;font-weight:normal" x="514.5" y="293">
+    <tspan x="514.5" y="293"></tspan>
+  </text>
+  <text style="fill: #1e90ff;text-anchor:start;font-size:14.6756;font-family:sanserif;font-style:normal;font-weight:normal" x="475" y="130">
+    <tspan x="475" y="130">XMPP Server</tspan>
+  </text>
+</svg>
diff --git a/scripts/titlepage.templates.xml b/scripts/titlepage.templates.xml
index 3f6f6b9..c1b7916 100644
--- a/scripts/titlepage.templates.xml
+++ b/scripts/titlepage.templates.xml
@@ -78,7 +78,7 @@
 
     <!-- the space after is an uggly hack to force the generated toc
     onto a new page -->
-    <revhistory space-before="3.5in"
+    <revhistory space-before="3in"
 		start-indent="0pt"
 		end-indent="0pt"
 		font-size="&hsize0space;"/>
diff --git a/ytstenut-protocol.xml b/ytstenut-protocol.xml
index 0e86a6c..749dcb6 100644
--- a/ytstenut-protocol.xml
+++ b/ytstenut-protocol.xml
@@ -69,6 +69,14 @@
 	   General edits.
 	 </revremark>
       </revision>
+
+      <revision>
+         <revnumber>0.7</revnumber>
+         <date>15 December 2010</date>
+         <revremark>
+	   Improvements to Introduction, diagrams
+	 </revremark>
+      </revision>
     </revhistory>
 
     <copyright>
@@ -176,40 +184,97 @@
       </listitem>
     </itemizedlist>
 
-    <section xml:id="intro-usecases">
-      <title>Service Models</title>
+    <section xml:id="intro-big-picture">
+      <title>The Big Picture</title>
+
+      <figure xml:id="fig-two-app-mesh">
+	<title>Two-application mesh</title>
+	<mediaobject>
+	  <imageobject>
+	    <imagedata align="center" width="95%"
+		       fileref="images/basic_structure.svg"/>
+	  </imageobject>
+	</mediaobject>
+      </figure>
 
       <para>
-	Ytstenut services fall into two broad categories:
+	The preceding diagram outlines a Ytstenut mesh consisting of two
+	applications on two devices. Note the separation between the metadata
+	and status channel, provided by the Ytstenut framework, and the actual
+	content data transfer, which is happening outwidth the framework, and
+	relies on other industry standards.
       </para>
 
       <para>
-	<itemizedlist>
-	  <listitem>
-	    <para>
-	      Subscription-based services: these are provided by discrete
-	      entities, each operating their own Ytstenut server. Ytstenut users
-	      connect to this server using credentials agreed with the service
-	      provider, and interact with applications offered by the service
-	      provider through their server.
-	    </para>
-	  </listitem>
-	  <listitem>
-	    <para>
-	      Applications interacting within a home cloud: the home cloud use
-	      case differs from the subscription service by the absence of a
-	      central server; instead the cloud transparently fulfils the role
-	      of a subscription-less server.
-	    </para>
-	  </listitem>
-	</itemizedlist>
+	The Ytstenut mesh, may, of course consist of any number of
+	applications, on any number of devices (potentially with multiple
+	applications on any single device). The possible topologies of the mesh
+	are described in the following section.
       </para>
 
+    </section>
+
+    <section xml:id="intro-topologies">
+      <title>Ytstenut Mesh Topologies</title>
+
       <para>
-	The Ytstenut framework aims to support both of these scenarios in a
-	transparent manner.
+	The application mesh established through the Ytstenut framework can have
+	two basic topologies: server-centric, and server-less home cloud. The
+	Ytstenut framework aims to support both of these scenarios in a
+	transparent manner, and it is possible that additional mesh topologies
+	will be facilitated in future versions of this protocol.
       </para>
 
+      <section xml:id="intro-topologies-server">
+	<title>Server-based Mesh</title>
+
+      <figure xml:id="fig-two-server-mesh">
+	<title>Server mesh</title>
+	<mediaobject>
+	  <imageobject>
+	    <imagedata align="center" width="95%"
+		       fileref="images/server_mesh.svg"/>
+	  </imageobject>
+	</mediaobject>
+      </figure>
+
+	<para>
+	  In a server-based mesh applications communicate with each other via a
+	  central server (NB: only metadata and status information is passed
+	  through the server; content is passed out of band). This type of mesh
+	  provides two principal benefits: it places no requirements on the
+	  topology of the underlying network, and it gives the server operator
+	  complete control over access and services on offer. As such, the
+	  server-based mesh is well suited, for example, for subscription
+	  services.
+	</para>
+
+      </section>
+
+      <section xml:id="intro-topologies-cloud">
+	<title>LAN-based Cloud Mesh</title>
+
+      <figure xml:id="fig-two-cloud-mesh">
+	<title>Cloud mesh</title>
+	<mediaobject>
+	  <imageobject>
+	    <imagedata align="center" width="95%"
+		       fileref="images/cloud_mesh.svg"/>
+	  </imageobject>
+	</mediaobject>
+      </figure>
+
+	<para>
+	  The LAN-based cloud mesh differs from server-based mesh by the absence
+	  of a central server; instead applications are able to discover each
+	  other, and communicate, transparently throughout the cloud. The main
+	  benefit of the LAN-based cloud is eliminating the need for operating
+	  and administrating a server; as such this type of mesh is particularly
+	  suited for the domestic use case.
+	</para>
+
+      </section>
+
     </section>
 
     <section xml:id="intro-application-classes">