Hi.
Thanks for the answers, David and Abel. For some reason I don't know, I
used the "X | Y" solution before but skipped it (it's time for the
Christmas vacations...). It works perfectly well. The example with the
key is nice, too, for this is a feature that I tend to neglect.
Regards and Merry Christmas
Manuel
PS: If someone on the list has a similar problem: There is one point in
the concat() solution, that goes beyond my previously specified problem:
If there are two authors, one of the book and one of the series (for any
reason), the <sort select="concat()" /> sorts with respect to both the
book and the series author.
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