Where is the HTML5 Document Type Definition?

Question

The \"old\" HTML/XHTML standards have a DTD (Document Type Definition) defined for them:

HTML 4.01 http://www.w3.org/TR/html401/sgml/dtd.html
XHTML 1.0 http://ww

Answer 1

Certain Marcus from sgmljs.net created and analyzed an SGML DTD for HTML 5.1 and started a thread in the XML-DEV mailing list for review and discussion. The discussion revolves around entity definitions so far.

I've just completed my analysis of W3C's HTML 5.1 recommendation at http://sgmljs.net/docs/html5.html (from a markup language rather than web development PoV), and I'm publishing it here for review in the form of an initial SGML DTD for parsing HTML 5.1, along with a lengthy analysis text.

[…]

I'm aware that WHATWG and W3C have since long moved away from SGML (and XML in most web-related specification work), treating it as a legacy technique and with a somewhat presumptuous attitude in the specification text and elsewhere. But as the analysis of HTML5's grammar shows, they've essentially abandoned use of any formal methods alltogether (and it shows in at least two flaws discussed in the analysis).

Nothing official yet, but maybe this initiative will get traction, or at least find its users as an unofficial resource.