Using two XSLT stylesheets

I'm working on a read only database. I have the data encoded as XML and am writing the queries using XSLT stylesheets. The only way I can find (being, of course, restricted to XSLT 1.0 on PHP) of executing the required queries requires two stylesheets. The generates a result tree which needs to be proceesed by the second. But I can't find a way of doing this. I've tried: xslt_process($xh, 'library.xml', 'simple-search-get-results.xsl', --> 'results.xml', NULL, $params); $data = xslt_process($xh, 'results.xml', --> 'simple-search-display-results.xsl', NULL, NULL, NULL); and: $results = xslt_process($xh, 'library.xml', 'simple-search-get-results.xsl', --> NULL, NULL, $params); $data = xslt_process($xh, $results, 'simple-search-display-results.xsl', --> NULL, NULL, NULL); neither of which work at all. Any ideas? Cheers, rich. -- UEA/MUS::Record Library http://www.cursus.uea.ac.uk/cdlib/