From: Tomas Frydrych (tomasfrydrych_at_yahoo.co.uk)
Date: Fri Dec 12 2003 - 04:49:24 EST
each new doc is now assinged UID which it carries throught out its
life time; this allows us to trace document pedegree.
added some PD_Document functions for comparing docs:
bool areDocumentsRelated(); // identical UID's
None of these has been tested extensively.
files: pf_Frag*.h/cpp, pd_Iterator.h/cpp, pd_Document.h/cpp,
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