On this page I see examples of both "page" and "pages". http://www.loc.gov/standards/mods/v3/mods-userguide-elements.html#part I would advise looking at whether there is a different context in which your contributors are using "page" as opposed to "pages." Best, Lisa On Nov 4, 2016, at 9:39 PM, Richard Karnesky <[log in to unmask]<mailto:[log in to unmask]>> wrote: 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