[NTG-context] xml input

I would like to process several input sources as one xml tree. Like this: <?xml version="1.0" encoding="UTF-8"?> <takenotes> <include buffer="notes-example"/> <include file="notes-example.xml"/> </takenotes> with the sources having the structure <notes> <note>...</note> ... </notes> and the code for <takenotes> containing: read from all sources given on <include>-notes afterwards process all content at once Thus the content of the various source should be read into one tree to be processed, but I cannot get this done. How to amalgam this separate sources into one? Hans van der Meer