RE: [docbook-apps] Re: [docbook] Polymorphic Modular DocBook

>> If you are using a Java XSLT processor, you 
could use xmllint --xinclude as a preprocessor step to resolve 
XIncludes before feeding the result to Saxon. <<

A word of caution; if extensively utilizing xinclude / xpointer in large
documents, validation and/or transformation performance may slow to a crawl.

Ray