XInclude of part of current document

The XInclude spec seems to allow an href from an xi:include to part of the 
current document, by using either an empty href or an absent href in the 
xi:include element.  However, it doesn't seem to work.

When I process an internal XInclude reference using xmllint, it reports 
"XInclude error : detected a recursion", even though the element being 
included (a para) is not recursively including anything.

When I process with Saxon using the XInclude option of Xerces, I get this 
error:

"org.xml.sax.SAXParseException: Include operation failed, reverting to 
fallback. Resource error reading file as XML (href=''). Reason: An xpointer 
was specified that points to a location in the source infoset. This 
location cannot be accessed due to the streaming nature of the processor."

Has anyone managed to get this to work?

Bob Stayton
Sagehill Enterprises
DocBook Consulting