How is a PDFXML document created?
PDFXML documents can be created by using XML components representing pages and the overall document structure and then combining them in a Zip package using off-the-shelf XML and ZIP tools. In addition, with the PDFXML plug-in and Adobe Acrobat, you can save PDF documents in PDFXML format. The PDFXML plug-in to create and view a PDFXML document is available on Adobe Labs. Additional documentation is also available on the Mars Labs site. The easiest way to get there is http://www.adobe.com/go/mars.