Register the contributed stylesheets with an URN in the XML catalog.

Signed-off-by: Florian Thienel <florian@thienel.org>
diff --git a/org.eclipse.vex.dita/plugin.xml b/org.eclipse.vex.dita/plugin.xml
index b5f1cfc..d22d5bf 100644
--- a/org.eclipse.vex.dita/plugin.xml
+++ b/org.eclipse.vex.dita/plugin.xml
@@ -50,6 +50,14 @@
              publicId="-//OASIS//DTD DITA Map//EN"
              uri="dita11/map.dtd">
        </public>
+       <uri
+             name="urn:org:eclipse:vex:styles:dita:classed_shell.css"
+             uri="css/dita_classed_shell_vex.css">
+       </uri>
+       <uri
+             name="urn:org:eclipse:vex:styles:dita:map_shell.css"
+             uri="css/map_shell.css">
+       </uri>
     </catalogContribution>
  </extension>
 	
diff --git a/org.eclipse.vex.docbook/plugin.xml b/org.eclipse.vex.docbook/plugin.xml
index 97f7b9f..15d7c88 100644
--- a/org.eclipse.vex.docbook/plugin.xml
+++ b/org.eclipse.vex.docbook/plugin.xml
@@ -16,6 +16,10 @@
              uri="4.5/docbookx.dtd"
              webURL="http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
        </public>
+       <uri
+             name="urn:org:eclipse:vex:styles:docbook:docbook-plain.css"
+             uri="styles/docbook-plain.css">
+       </uri>
     </catalogContribution>
  </extension>
 
diff --git a/org.eclipse.vex.xhtml/plugin.xml b/org.eclipse.vex.xhtml/plugin.xml
index 451a25c..00ffcb9 100644
--- a/org.eclipse.vex.xhtml/plugin.xml
+++ b/org.eclipse.vex.xhtml/plugin.xml
@@ -6,6 +6,24 @@
 			base-type="org.eclipse.vex.ui.XmlDocument" file-extensions="xml, xhtml">

 		</content-type>

 	</extension>

+ <extension

+       point="org.eclipse.wst.xml.core.catalogContributions">

+    <catalogContribution

+          id="default">

+       <uri

+             name="urn:org:eclipse:vex:styles:xhtml:xhtml1-plain.css"

+             uri="styles/xhtml1-plain.css">

+       </uri>

+       <uri

+             name="urn:org:eclipse:vex:styles:xhtml:xhtml1-sans.css"

+             uri="styles/xhtml1-sans.css">

+       </uri>

+       <uri

+             name="urn:org:eclipse:vex:styles:xhtml:xhtml1-modern.css"

+             uri="styles/xhtml1-modern.css">

+       </uri>

+    </catalogContribution>

+ </extension>

 

 	<extension point="org.eclipse.vex.ui.doctypes"

 			   id="xhtml_1_0_strict"