XAR DTD

[Daniel Carrera]

Hello,

Where can I fin the XAR DTD? Ultimately, what I want to figure out is
what XML fields are required in the table of contents, and what XML
fields I am permitted to add.

A couple of friends and need to come up with a simple archive format.
It occurred to me that we could take XAR and remove features or
otherwise restrict the format to make it simpler. That way we get a
format that is easy today, but has room for extension in the future.
To be clear, I would like to retain enough compatibility with xar that
the xar tool can extract the package.

Anyways, the first thing I need is to understand the XML format for
the ToC.

My next questions are about the header:
(1) Do I have to compress the XML?
(2) How do I convey that the header is not compressed?
(3) What is cksum_alg?

Thanks.