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.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"