<!--  resolve OR terms by seperate xsl:copy-of  //-->

why not just use the xpath and and or?

both of your examples


((author='Knuth' OR title='Algorithms') AND releaseDate >= 1999) or another
one
((title='Windows XP' AND doctype='manual') OR (doctype='manpage' ANDNOT
title='Linux' ))



would be legal XPath as written if you use and instead of AND and or
instead of OR and  and  not(   ) instead of ANDNOT.

David

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