Subject: Re: Why Doesn't IE5 use the DTD to Validate? From: James Clark <jjc@xxxxxxxxxx> Date: Fri, 02 Apr 1999 08:20:42 +0700 |
Chris Lilley wrote: > Heh. What you are saying is, have some sort of switch in the document > which says whether the document is asserted to be valid or whether it is > just well formed? > > But that of course already exists, and people can choose to make just > well-formed documents if they want. What switch is that? This document <doc>foo</doc> is well-formed but not valid. This document also is well-formed but not valid: <!DOCTYPE doc [ <!ATTLIST doc a CDATA "default"> ]> <doc>foo</doc> Neither contains an assertion that is valid. Systems that assume that a document is meant to be valid merely because it contains a DOCTYPE declaration are broken; there's nothing in the XML spec that licenses such an assumption. > > The inclusion of a DTD could be interpreted as switch indicating to > > the interpreter that structural integrity check has to be done on the > > document. > > Not "could be"; *is&*. That is the intent of the XML 1.0 spec. That's news to me. > That is > what a validating parser does when encountering a document with a > doctype declaration and an internal subset with anything other than just > entity declarations. So what is this switch? The DOCTYPE declaration? The DOCTYPE declaration unless it's just an internal subset containing entity declarations? What if I have default attributes declared as well? What if I have so many entities that I use an external subset instead? Where does the XML spec mention such a switch? I know Microsoft-bashing is good, clean fun, but actually they've done the right thing here. James XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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