- From: Henri Sivonen <hsivonen@iki.fi>
- Date: Wed, 6 Jan 2010 15:40:16 +0200
- To: Ian Hickson <ian@hixie.ch>
- Cc: Joe D Williams <joedwil@earthlink.net>, public-html@w3.org
On Jan 6, 2010, at 09:21, Ian Hickson wrote: >> Is there structure, content models, or combinations of HTML5 that cannot >> be modelled by xml schema? > > Insofar as there are structures that cannot be modeled by the XML Infoset, > yes. There may also be conformance requirements that cannot be fully > expressed by XML Schema itself, but I'm not familiar enough with XML > Schema to say whether this is the case or not. Henri might know. (It is > the case that SGML DTDs, XML DTDs, RelaxNG, and Schematron all cannot > fully express all the machine-checkable conformance requirements of HTML, > so I would be surprised if it wasn't also the case for XML Schema.) XML Schema is less expressive than RELAX NG[1], so XML Schema cannot capture all the document conformance requirements of HTML5, either. [1] http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.80.4356&rep=rep1&type=pdf -- Henri Sivonen hsivonen@iki.fi http://hsivonen.iki.fi/
Received on Wednesday, 6 January 2010 13:40:52 UTC