> I want to select the string from the last position, but if it is empty, then
> i want select, the preceding text-node

rephrase that to say

I want to select the last node with non empty string value.

then it's easy:

select="DARBEDINGUNG[not(.='')][last()]"

Note that if all your DARBEDINGUNG nodes are siblings then adding using
// as in
//DARBEDINGUNG
is slowing down the search fro no reason.

David


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