[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XPath 1.5? (was RE: typing and markup)
Jeni Tennison wrote: > There are several aspects of HTML that can't be validated by > grammar-based schema languages, such as the fact that form elements > shouldn't occur within other form elements at any level [...] The HTML DTD specifies this constraint with an exclusion exception (a feature that was left out of XML): <!ELEMENT FORM - - %body.content -(FORM) +(INPUT|SELECT|TEXTAREA)> TREX can also express it concisely with a combination of CONCUR and NOTALLOWED. CONCUR was left out of RELAX-NG, but it can also express this constraint, as can RELAX and any other schema language based on tree-regular grammars. --Joe English jenglish@f...
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