WS-Directory does not currently store any properties with its entries. To get properties you have to contact the actual 
service.  This would have efficiency problems.  In the file system domain this would probably not be acceptable.  one 
alternative would be to map from strings to an XML document; another would be to add metadata into the EPR itself.  Jay 
suggested that strings could map to a pair of EPRs,
one for the resource and one for the metadata document, but this also involves extra invocations.

If metadata is stored with the directory service, issues of coherence arise.  It also potentially gives the possibility 
of lookup on the metadata..