Reference pages using the
page-number-citation,
its ref-id references
an element with an equal attribute id.
Source
<
fo:root xmlns:fo="
http://www.w3.org/1999/XSL/Format" >
<
fo:layout-master-set>
<
fo:simple-page-master master-name="simple">
<
fo:region-body/>
</
fo:simple-page-master>
</
fo:layout-master-set>
<
fo:page-sequence master-reference="simple">
<
fo:flow flow-name="xsl-region-body">
<
fo:block id="A">
Block with id="A".
The block with id="B" is on page
<
fo:page-number-citation ref-id="B"/>.
</
fo:block>
<
fo:block break-before="page"
id="B">
Block with id="B".
The block with id="A" is on page
<
fo:page-number-citation ref-id="A"/>.
</
fo:block>
</
fo:flow>
</
fo:page-sequence>
</
fo:root>