xsl-fo template and pdf attachment

Ok

First, I can't find the equevilant feature to apache fop extention that allow attaching a pdf file to my pdf report generated using xsl-fo template, is there an option like that?

If not, I see some java code that use PDFAttachment(...) but how I can use that with my xsl-fo template base report? where do I save that code? where do I call that code?

If not, what if I attache the files later after I generate the pdf report, but I need while creating the report to have internal links to that attachment. How I can create in xsl-fo an internal link to an attached pdf file?