Different footer text on each page

I'm using the Java XML API to create a document tree and then using FOP
to render the PDF. I've created simple footers that show the current
page and reference the last page. Now I'd like to customize the footer
per page. Instead of "Page 2 of 3" in the footer, I'd like to have
"Before: next page title      Page 2 of 3" where "next page title"
changes per page. I understand that the page number and last page
numbers are special tags that get populated at render time. Is it
possible to modify the footer content per page with a single page
sequence, or do I need to create a page sequence for each unique
footer? 

If I need a page sequence for each, how do I get the last page number
of the last sequence so that I can still populate "Page 2 of 3"?

Thank you,
Jon