I have a question about the <author> element. It can occur as a
daughter of a bunch of elements, but there are two parents where its
usage seems a bit unclear to me: <info> and <authorgroup>. The intent
is clear: <author> should appear under <authorgroup> "when a document
has multiple authors or collabarators"
(http://www.docbook.org/tdg5/en/html/authorgroup.html). So in the
context of a book or chapter or author, multiple authors should be under
/book/info/authorgroup/. However, afaik there's nothing in the schema
preventing one from having both /book/info/authorgroup/author and
/book/info/author *in the same document*. (It's not clear to me whether
one could have multiple <author> daughters of /book/info/, or just one.
I think there can be multiples.)
What is the intent if there's an <author> under both paths? Ideally, I
guess they'd be combined in some smart way; or else there should be a
warning. The combination of course has to be handled by the particular
app you're using to convert the XML into some other form. But a
warning--if appropriate--would come from the schemas. (Probably not
possible with rng; maybe there could be a schematron rule?)
The same thing happens with <editor> and <othercredit>, both of which
can appear in the same places as <author>; and the same possibility of
putting these elements under <someelement>/<authorgroup> or directly
under <someelement> happens with <biblioentry> and probably several
other places.
BTW, the question came up because we had <author> in both places, and I
was trying to debug why someone's name wasn't showing up in the PDF.
Mike Maxwell
University of Maryland
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