- Moved URIParser.xpointer to its own XPaths internal class.
- Renamed URIParser as DefinitionURI, which describe better what this object is about.
- Replaced the annotation on AbstractIdentifiedObject.identifiers by a pair of getter/setter methods,
  in order to get more control on the URN to be marshalled.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1552879 13f79535-47bb-0310-9956-ffa450edef68