Brilliant! That's exactly what I'm looking for.

I've popped some line breaks in to make it easier for the next developer,
tested it and am really happy with it:

      <xsl:apply-templates select="//blog
                           [not($AuthorId) or (author_id = $AuthorId)]
                           [not($CategoryId) or (category_id = $CategoryId)]
                           "/>

Thanks so much for your help!


-----Original Message-----
From: Vyacheslav Sedov [mailto:vyacheslav.sedov@xxxxxxxxx]
Sent: 20 August 2009 14:46
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  Avoiding multiple "apply-templates" by creating one
variable for the clauses. Is it possible?

what about //blog[not($AuthorId) or (author_id =
$AuthorId)][not($CategoryId) or (category_id = $CategoryId)]