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xslt 2 grouping


With the following XML I'm trying to group and find uniques

<p>
<el att='a'>x</el>
<el att='b'>x</el>
<el att='c'>x</el>
<el att='d'>y</el>
</p>
I have about 1200 lines of this, so keys are out.

I want to find all the el elements with content 'a'
which have *different* att attribute values,

to produce

<el name='x'>a b c </el>

I.e. list x, together with all the attributes att
which are different.

I'm guessing its a good one for xslt 2, for-each and group-by,
but I'm stumped on the syntax.

Any help appreciated,
DaveP.



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