An author/editor of the current document.
authorlist, editors, otherauthors
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author |_(#PCDATA)
An email address for the author.
A home page for the author, which might contain further contact details.
The `home institution' of an author, such as `Starlink, University of Glasgow'.
An ID which may be used to refer to the author from within a history element, for example.
The role this individual has played in the maintenance of this document, if it's different from the straightforward `author'. For example, this might be `maintainer', `original version', and so on.