insert.xref.page.number.para — Turns page numbers in xrefs to paragraphs on and
    off
<xsl:param name="insert.xref.page.number.para">yes</xsl:param>
The value of this parameter determines if
  cross references (xrefs) to paragraphs in
  printed output will include page number citations.
  
Historically, cross references to paragraphs
  included page number citations unconditionally, regardless
  of the insert.xref.page.number
  value.
Page number references will be generated for paragraphs.
Whether page number references are generated
  for an xref element referring to a paragraph will
  be controlled by the insert.xref.page.number
  rules.