Why is XHTML1.1 dated *before* XHTML1.0 ? What is the preferred XHTML today?

I'm not clear on the status of XHTML - v1.0 versus v1.1. Can someone explain which is preferred at this point, and why?

The specs from W3C say that XHTML 1.1 *predates** XHTML 1.0, which is very counter-intuitive, to me:

http://www.w3.org/TR/xhtml11/ - W3C Recommendation 31 May 2001

http://www.w3.org/TR/xhtml1/ - W3C Recommentation, updated 1 August 2002

Also, I noted earlier today that the latest version of htmltidy emits XHTML 1.0, when I request XHTML. Hmmm....Even though the XHTML 1.1 spec is 9 years old, it's still not supported by mainstream tools. That suggests that XHTML 1.1 is either completely unnecessary or spurious.

Which one should I use if I am authoring pages today? What if I am building tools - should I 开发者_如何学Cbother to support both? Or do I need only one?

Thanks.

If you open the XHTML 1.0 document and click on the diff-marked version you see that the differences are mostly/only (did not check thorough) formatting and grammar changes.

The original of this document is older than the XHTML 1.1 document, so I would think they just updated the document to comply with a newer format.

Besides the original XHTML 1.0 documentation is older than 1.1 as answered by others,-

The XHTML 1.1 page you've linked to just describe the structure. The "modules", which actually defines the elements, are listed in http://www.w3.org/TR/xhtml-modularization/ and the last update is in 2008.

Not really my forte, but maybe this article will shed some light.
Also according to wikipedia and w3 there is no question of predating:

http://www.w3.org/TR/xhtml1/ - W3C Recommentation, 26 January 2000, revised 1 August 2002

As far as I know, XHTML 1.1 was the first fully fledged XML based version of the language. This means that XHTML 1.1 should be served with the application/xhtml+xml mime type.

XHTML 1.0 was added as an intermediate between the fully fledged XML language (XHTML 1.1) and HTML 4 (Mime type text/html).

At least that's my understanding upto this point.