XInclude Processing in XSLT
Erik Wilde discusses
XInclude Processing in XSLT on O'Reilly.
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Assembling various parts of a document before processing the assembled document is a recurring theme in document processing. XML Inclusions (XInclude) is the W3C standard created to support this scenario, but since it is a standalone specification, it needs to be supported by a piece of software implementing this functionality. The XInclude Processor (XIPr), written in XSLT 2.0, implements XInclude and thus may help to reduce the dependency on numerous software packages if XInclude is used in an environment where XSLT 2.0 is used anyway."