xbiblio-devel Digest, Vol 21, Issue 15

Would it make more sense to rename “page” as “pages” when you add
"first-page"? Seems more logical.

Yes. Also prefix with ‘total-’ if that is what is intended.

Actually, for usability, perhaps these qualifiers should be post fix:
“page-first,” “page-total,” and/or “page-range.”

–Rick