Hi,  Chris,
Thanks for the good  solution,   I can see your point now; 
 
> Chris writes
>Ok you want
><xsl:for-each
select="$source[contains($keywrd,.)]|$source[$keywrd='']">

The select attr  is actually expressed from union of two sets,   this is
something I can use from now on.
Just for curiosity, will it cost some speed performance  by going
through two patterns each time?  Or a
better solution for what I want to achieve?

regards
Sun-fu Yang

sfyang@xxxxxxxxxxxxx


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