[tracker] Doc: XSD ontology explanation.

[Ivan Frade <ifrade src gnome org>]

commit 3b6c32794bba40797dd10de51489b9fadb2c9aac
Author: Ivan Frade <ivan frade nokia com>
Date:   Thu Nov 26 16:44:21 2009 +0200

    Doc: XSD ontology explanation.
    
    Not much to say about it.

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+<h2>Overview</h2>
+<p>This ontology is a translation into RDF classes of the
+  XML Schema data types supported by tracker. These are only a subset
+  of the official <a href="http://www.w3.org/TR/xmlschema-2/";>W3C
+  specification</a>. Any other divergency between the
+  specs should be considered a bug in this document, and can be
+  reported in the 
+  <a href="http://mail.gnome.org/mailman/listinfo/tracker-list";>Tracker
+  mailing list</a>.
+</p>