Thx all, 
i make you an example for calrify what i need to do 
(put "<" instead of "(" ):

TEMPLATE 1:
(xsl:template match="fields[descendant::field[contains(@id, 'Metadata')]]")
(xsl:for-each select="field[contains(@id,'classMetadata')]")
(xsl:variable name="var" select="@value")
(/xsl:template)

TEMPLATE 2:
(xsl:template match="fields[descendant::field[utils:endsWith(@id, $var)]]")
 ecc
 ...
 
(/xsl:template)


so how you can see both my two templates match something but the second use the variable create in the first as argument of it's match i hope is possible with param doing something like this

thx for replies