xsl question

Hi,

I'm trying to write a xsl script that counts all times an attribute contains some text
I use contain() and count(), but is it possible to count elements that contains some value??
I try somethins like this:
<xsl:if test="count(contains(document($ARCH_LNK_JJ)/Doc/Laes/JudDoc/Ref/@idproducto,$producto)) &gt; 0">

but I get an error... because contains returns a boolean value..

thank you!
Esteban