Including pdf uri when emailing xdp data

Question

I'm trying to create an e-mail button which e-mails the xdp data along with a reference to the associated pdf.
The XML Forms Architecture Specification (3.1) says the following about the submit element:
function(){return A.apply(null,[this].concat($A(arguments)))}
The embedPDF property
0 [default] = The associated PDF document is not embedded in the XDP PDF packet; rather, a URI is optionally
provided. The URI must resolve to a PDF resource of MIME type pdf. The URI is the value of the
href attribute in the XDP PDF packet. The URI may be obtained from the XFDF F-key path, which
is relative to the system on which the original PDF file was created. If the URI is unavailable, neither
the PDF itself nor a URI is included in the PDF packet in the submitted XDP.
The way I interpret it is that when Reader exports the xdp data to the e-mail application, it inserts the value of the xfdf-snippets f-tag into the xdp data's <pdf href=""> tag. So I went ahead and added (in bold):
<xfdf xmlns="http://ns.adobe.com/xfdf/" xml:space="preserve">
   <f href="http://server/populate_me.pdf"/>
   <annots/>
</xfdf>
Needless to say I won't work. Upon filling out the form in Reader and clicking the e-mail button, the reference I'm getting in the exported xdp is:
<pdf href="populate_me.pdf" xmlns="http://ns.adobe.com/xdp/pdf/"/>
(what I want is <pdf href="http://server/populate_me.pdf" xmlns="http://ns.adobe.com/xdp/pdf/"/> )
I'd really appreciate some advice.

Answer 1

I believe the ability to create an XDP email attachment that would fetch the form was removed after Reader 9. It might have been for security reasons.
If you or someone else finds the answer to this one, I would appreciate it if you/they could send it to me.
In designer, we're using a button containing the following xml:
            <event activity="click">
               <submit textEncoding="UTF-8" xdpContent="pdf datasets xfdf xdp" target="mailto:"/>
            </event>
It used to work fine if the form that created the email attachment generated it while the Reader plugin was inside the browser window at the time the email was created.
Is the form at least populating the subject field of the email with the uri? Ours is, using the code above.