+       <declare>
+               <prefix>pcdm</prefix>
+               <namespace>http://pcdm.org/models#</namespace>
+       </declare>
+       <declare>
+               <prefix>pcdmuse</prefix>
+               <namespace>http://pcdm.org/use#</namespace>
+       </declare>
+       <declare>
+               <prefix>pcdmworks</prefix>
+               <namespace>http://pcdm.org/works#</namespace>
+       </declare>