[gnome-devel-docs/dx-hackfest: 16/18] platform-overview: Fill in the Tracker page

[Federico Mena Quintero <federico src gnome org>]

commit b7d37553e55a405fe55c7e057706bea94f275c40
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Jan 31 17:25:47 2013 +0100

    platform-overview: Fill in the Tracker page
    
    Signed-off-by: Federico Mena Quintero <federico gnome org>

 platform-overview/C/tracker.page |   35 +++++++++++++++++++++++++++++++++--
 1 files changed, 33 insertions(+), 2 deletions(-)
---
diff --git a/platform-overview/C/tracker.page b/platform-overview/C/tracker.page
index 5273074..c9304d0 100644
--- a/platform-overview/C/tracker.page
+++ b/platform-overview/C/tracker.page
@@ -2,10 +2,41 @@
       type="topic"
       id="tracker">
 <info>
-  <link type="guide" xref="index" group="apps"/>
+  <link type="guide" xref="index" group="tracker"/>
   <desc>Storage and retrieval for document metadata</desc>
 </info>
 
-<title>Tracker</title>
+  <title>Tracker</title>
+
+  <p>
+    Tracker is an RDF (resource data format) storage engine.  RDF consists of
+    <em>triplets</em> such as subject:verb:object.  For example, there could be
+    standard triplets for book titles and authors, such as
+    <code>Othello:has-author:William Shakespeare</code>.  A standardized set of
+    triplet forms is called an <em>ontology</em>.
+  </p>
+
+  <p>
+    Tracker provides a storage for such triplets, and a query engine in the
+    form of the SPARQL query language.
+  </p>
+
+  <p>
+    Gnome uses Tracker as a storage for document metadata.  A document's
+    metadata may include its title, authors, copyright, modification date, and
+    keywords.  All this metadata is stored as RDF triplets in Tracker, and queried
+    with SPARQL by applications such as Gnome Documents.  The <a
+      href="http://developer.gnome.org/ontology/unstable/";>ontology used</a> is based
+    on various standard sub-ontologies:  <link xref="http://dublincore.org/";>Dublin
+      Core</link> for document metadata, and <link
+      xref="http://nepomuk.kde.org/";>NEPOMUK</link> for annotations, files, contacts,
+    and other items.
+  </p>
+
+  <list style="compact">
+    <item><p><link href="http://projects.gnome.org/tracker/";>Tracker Home Page</link></p></item>
+    <item><p><link href="https://live.gnome.org/Tracker/Documentation";>Tracker documentation</link></p></item>
+  </list>
+  
 
 </page>