SUMMARY: XML Validation Issues (was: several threads)
tbray at textuality.com
Thu Apr 8 17:22:32 BST 1999
At 01:38 AM 4/7/99 +0200, Chris Lilley wrote:
I mostly agree with Chris, but a couple of notes.
>True, but the assertion was made that validation should never be
>required because of the performance load (compared to parsing the dtd
>including external subsets, but not validating). Which implies, if there
>were negligible performance load, them whould validation be a desirable
It still depends. In lots of scenarios, validation isn't worth even
an extra 1% investment in time. In lots of scenarios, there's no DTD!
Having said that, a guaranteed-lightweight validation protocol would
>I didn't like it much either, but it seemed to be, on inspection, what
>the XML spec said.
>James Clark seemed to agree, which was a good sign. But I recently heard
>Tim Bray and CMSQ say that no, it doesn't mean that at all
What the spec itself says is more important than what any of us
individuals say. I really don't think you can find justification
in the spec for the notion that the existence of a <!DOCTYPE is
a signal requiring any kind of action.
>(not to UI designers, provide two
>separate icons for "validate" and "check wf" )
Yes! IE5 has a nice validation capability, but no way (that I've
found) for the user to invoke it. Is there one?
>Next question, should there be (in other words, is this something that
>should be in the document instance).
Good question; I can see both sides. But in fact, Chris, I think what's
motivating you here is less a concern for forcing validation than a
concern for forcing the use of the external DTD for entity declarations
& attribute defaults and so on. Which is fine; but I think there are
2 separate questions here:
- should a document be able to ask for validation
- should a document be able to ask for guaranteed reading of all
Related but distinct. -Tim
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