Compare attribute values (fwd)

It seems that my question with same subject was
- unclear
- stupid
- nonsensical
- other possibilites...

In the hope that the first guess is the good, I will try to reformulate it
:
When encountering an l element, I want to select an element nameloc
somewhere in the tree, whose ID has the same value as attribute linkend of
the current one (l).
So, the tries I made failed and I don't see how to express the selection
condition. 

Any clue.
TIA. Jany.


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