Describes the author of a function.
The author element includes full details about an author, and has a required ID attribute. This ID is a key which is intended to be unique to a particular author (it's not an SGML ID attribute which would be guaranteed unique, but which causes other problems in this case).
(name ,
authornote ?
)
author |_(name, |__authornote?)
An email address for the author.
A URL for the author.
A unique ID for the author.
An optional affiliation for the author. It contains text such as `Starlink, University of Glasgow'.