added retired category since the project is in Attic

git-svn-id: https://svn.apache.org/repos/asf/xmlbeans/trunk@1690465 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/xkit/doap_XMLBeans.rdf b/xkit/doap_XMLBeans.rdf
index 5ad8610..6a0551e 100644
--- a/xkit/doap_XMLBeans.rdf
+++ b/xkit/doap_XMLBeans.rdf
@@ -45,6 +45,7 @@
     <download-page rdf:resource="http://www.apache.org/dyn/closer.cgi/xmlbeans/" />
     <programming-language>Java</programming-language>
     <category rdf:resource="http://projects.apache.org/category/xml" />
+    <category rdf:resource="http://projects.apache.org/category/retired" />
     <release>
       <Version>
         <name>XMLBeans v2.1.0</name>