How to: Using XSL-FOP appending two pdf byte array gen

Hi,
      I want to append two pdf outputs into a single pdf file. How do I do
this using FOP ?
I generate these two pdf outputs using XSL+XML and FOP. The output is
generated dynamically and I have the ByteArrayOutputStream as the resultant
pdf array.
These two needs to be appended and converted into a single
ByteArrayOutputStream which will represent the resulting pdf.

For e.g.: The first transformation gives two pages, second transformation
gives one page. Both are in the form of ByteArrayOutputStream.
I have to combine these two and make a single output ByteArrayOutputStream
having total three pages.

This result will be sent from server to the browser as the byte-array.

Regards,
Vinod Agarwal.
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