A content metamodel is formally described by an XML-schema document. When in
doubt about how to express a content model or understand the full capabilities of the content
metamodel, interrogate the XML schema as it provides the definitive description of the content
metamodel.
The target namespace of the content metamodel XML schema is
www.alfresco.org/model/dictionary/1.0
Note: You can locate the latest content metamodel XSD schema at:
http://svn.alfresco.com/repos/alfresco-open-mirror/alfresco/HEAD/root/projects/repository/config/alfresco/model/modelSchema.xsd