Where can I find XFA specs or DTD/schema?

I have a hard time finding specifications or a DTD, RNG, or XSD for XFA.

• Adobe lists the "Adobe Supplement to ISO 32000, BaseVersion 1.7, ExtensionLevel 3" on their PDF Reference page. On page 102, there is a link to the "Adobe XML Architecture specifications", however that link is dead, and archive.org did not archive it.

• There is an old W3C Note "XFA-Template", which has a link to a DTD, however that link is dead as well, and from archive.org I get the feeling it's never really been alive. (In any case, XFA-Template only seems to be a part of the XFA family of specifications.)

• A Google search for "site:adobe.com xfa specifications" turns up a link to "Introduction to XML forms architecture (XFA)". However, there is a DNS problem for me and I can't access it:
  $ traceroute6 help.adobe.com traceroute: unknown host help.adobe.com
  Archive.org doesn't help here either.

Any hint where to find that information?

I found a copy of the 3.3 Spec here...

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.364.2157&rep=rep1&type=pdf

Pages 1554-1555

The XFA schemas are written in the language RELAX: Next Generation (RNG) which is described in RELAX-NG. XFA schemas are written in this language rather than the more usual XML-Schema 1.0 because XFA allows free ordering in situations where XML-Schema cannot support it. ... The schemas are included as file attachments in the PDF form of this document. If you are viewing a hard copy, obtain the PDF file from the Adobe website at http://adobe.com/go/xfa_specifications.

note the xfa specifications link does not work, nor does goolge.com/archive.org have it cached.

Files in the specification

1. config.rng
   • configuration
2. connectionset.rng
   • connections to web services
3. data.rng
   • user data portion of the dataSets packet
4. dataDescription.rng
   • data description portion of the dataSets packet
5. localeset.rng
   • locale definitions
6. pdf.rng
   • accompanying PDF
7. sourceset.rng
   • connections to databases
8. stylesheet.rng
   • XSLT stylesheet(s) for custom transformation of data and/or the template
9. template.rng
   • template
10. xdp.rng
    • container for everything else
11. xfdf.rng
    • annotations
12. xmldsig-core-schema.rng
    • signing control

I'm not sure what your goal is but I wouldn't be investing much time in XFA. It's been removed from the PDF 2.0 specification.