Filtering the nodes passed to a template...

Hi,

I'm trying to pass certain (filtered) nodes to a template, using 'apply
templates'.  Normally I'd do

<apply-templates select="stuff[@things = gadgets]"/>

and that would do.  But this is more complicated...

My xml looks something like this

<report>
<payments>
	<payment id="..."/>
	<payment id="..."/>
</payments>
<paymentTypes>
	<paymentType paymentTypeRef="...">
	<paymentType paymentTypeRef="...">
</paymentTypes>
</report>

In the context of <report> I want to pass all the 'paymentTypes/paymentType'
nodes to a template, where @paymentTypeRef matches any @id attributes in
<payments>...phew!  In the template I'll be outputting the @paymentTypeRef
(amongst other things), but!!...I only want to output @paymentTypeRef if the
sibling node before it hasn't got the same value.

Any ideas??  I'd be very grateful.

Thanks,

Callum


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