Problem with multiple author elements in axf.xsl

The following select expression in the template with
name="axf-document-information" does not quite work if
you have multiple author elements (for example in
revhistory) in a document:

<xsl:with-param name="node" select="//author[1]"/>

It is supposed to select just the first author element, but in
fact it selects too much: namely every author element that
is the first child of its parent. Suggestion: update axf.xsl
using xep.xsl as a model.