How to extract PDF files from portfolio?

hi,

help needed.

I´d like to ask, how to extract PDFs from portfolio. I have to create portfolio, bcs i am creating PDFs with XFA data.

In first step i made PDF portfolio from PDF files, then user should fill it up. And then i need get PDF files, because i need extract data from them. For creation portfolio i use DDX :

<DDX xmlns="http://ns.adobe.com/DDX/1.0/">
  <PDF result="Acrobat 9 Portfolio">
    <Portfolio>
      <Navigator source="AdobeRevolve.nav"/>
      <Schema>
        <Field name="Character" type="Filename"/>
        <Field name="Location" type="Text"/>
      </Schema>
    </Portfolio>
    <PackageFiles>
      <PDF source="Swami.pdf"/>
      <PDF source="Sherlock.pdf"/>
      <FieldData name="Location">London</FieldData>
    </PackageFiles>
  </PDF>
</DDX>

I know extract data from one PDF document, but i need to get PDFs from portfolio. Can you HELP? Thanks.....