Optional further information about an author. This might be particularly useful when the author is one of those consigned to the otherauthors element.
For example, in the DSSSL code written for this SGML project, the ISO standard document describing DSSSL was used to supply various functions which were not implemented as primitives in the Jade system. The standard was therefore listed as an `other author' of some parts of the code, with a note explaining this in the authornote element.
authornote |_(p, |__(p | |___tabular)*)