The XSD schema used to denote suggested units as 'pages, minutes, etc.'
The outline of elements and attributes still does. Chris Putnam's bibutils
had to address this almost a decade ago. Postel would tell you to import
both and to export only 'pages'.
Also note that we've also talked about how to represent a reference that is
on a single page. Don't know where that is now, but I remember Chris had
changed bibutils to emit:
<detail type="page"><number>3</number></detail>
rather than your example:
<extent unit="pages">
<start>3</start>
</extent>
--Rick
