Conditional text using attributes

I'm trying to figure out how to exclude text and graphics from an output
file (HTML or FO, for example) by testing for attributes in my XSL
stylesheet. For instance, I have an XML file with instructions
appropriate for both Macintosh users and Windows users. In one output
file, I want to exclude the instructions for Mac users, and in another,
I want to exclude the instructions for Windows users so I end up with a
set appropriate to each type of user.

I'm using the DocBook DTD and Norm Walsh's DocBook XSL stylesheets
(http://nwalsh.com/docbook/xsl/index.html). I've created an XSL file
called "bj.xsl" that extends his HTML XSL stylesheet. In it, I have a
test case that (hopefully?) excludes all elements, attributes, comments
and text with the attribute "Mac":

*****************************************
<?xml version='1.0'?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version='1.0'
                xmlns="http://www.w3.org/TR/xhtml1/transitional"
                exclude-result-prefixes="#default">

<xsl:include href="docbook.xsl"/>

<xsl:template match="*|@*|comment()|text()">
 <xsl:if test="not(@os='Mac')">
  <xsl:copy>
   <xsl:apply-templates select="*|@*|comment()|text()" />
  </xsl:copy>
 </xsl:if>
</xsl:template>

</xsl:stylesheet>
*****************************************
This doesn't work, but I'm not sure what I'm doing wrong. Any
suggestions would be greatly appreciated.

--Beth Fischi



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