Hi Larry,
> [...]
> One of them is that each article in my book has multiple authors, in different
> positions. How would I differentiate a "primary author", "contributing
> authors", etc.? In the old code I was abusing the role attribute of
> <authorgroup>, but of course by default that's ignored by the DocBook XSL
> setup. What's the best way to denote them, semantically and
> transformationally?
>
> (Ideally I'd like to have a series of lists going across the page in the final
> output, something like:)
>
> Primary Contributing
> ---------- -----------------
> Joe Frank
> Bob Steve
>
Maybe you could use othercredit[1] with the use of a class attribute. There are other elements, depending on your context: editor, collab, corpauthor and corpcredit.
Hope that helps,
Tom
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[1] http://www.docbook.org/tdg/en/html/othercredit.html