xref.title-page.separator — Punctuation or space separating title from page number in xref
This parameter allows you to control the punctuation of certain
types of generated cross reference text.
When cross reference text is generated for an
xref or
olink element
using an xrefstyle attribute
that makes use of the select: feature,
and the selected components include both title and page number,
then the value of this parameter is inserted between
title and page number in the output.