<xsl:stylesheet version="1.1"
                ^^^^^^^^^^^^

Version 1.1 was a working draft but the working gropu stopped work on it
and will not release it as they decided to work on 2.0.

So there is no xsl:script. Many processors (including msxml, which you
might be using in xml spy) have extension elements that do similar
functionality. 

David

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 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list