<xsl:if test="Parent/MyNode=ENS">...</xsl:if>

        To select all "Parent" nodes that don't have a "MyNode" child.

an xsl:if doesn't select anything of course.
Rather than select too much and then use xsl:if to not process some of
them, just select the elements you want in the first place:

select="Parent[not(MyNode)]"

selects all elements called Parent that don't have a MyNode child.

David

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