David, When I try to use <xsl:output doctype-public> my xml editor  
  warns me that if I don't have a system identifier that the public  
  doctype will be ignored. Can you explain this?

It's helpful if you show _exactly_ what you have as 
<xsl:output doctype-public>
isn't well formed XML so would. not have got as far as running xslt or
generating any output.


You need something like
<xsl:output doctype-system="something.dtd"/>

David


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