<xsl:apply-templates select="//Module [@ModName=@ChildName]"

You want @ModName to refer to attributes of Module and @ChildName
to refer to attributes of Child but since you've used teh exact same
syntax for both, the system doesn't know that's what you want.

 <xsl:apply-templates select="//Module [@ModName=current()/@ChildName]"

will work *assuming that's what you want, every module whose ModName is
equal to a ChildName of a child of the current module)  although
whenever you have the syntax  
///foo[something]
it is potentially very expensive, searching teh entire document each
time and you will gain the same result quicker (usually) by using the
equivlent key expression, but get it working before optimising.

David

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