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   Re: [xml-dev] The waterfall model lives? (was Re: [xml-dev] The subsetti

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 From: "Elliotte Rusty Harold" <elharo@metalab.unc.edu>
> In practice, I think that's true, but I don't think there's anything 
> in the SAX spec that requires it. I don't see why you couldn't set 
> http://xml.org/sax/features/validation (Or 
> http://xml.org/sax/features/external-general-entities and 
> http://xml.org/sax/features/external-parameter-entities) some time 
> after the XML declaration has been read but before the root element 
> or perhaps the DOCTYPE declaration has been read, perhaps in 
> startDocument() or setDocumentLocator().

I agree that it would be better if SAX allowed features to be set after reading
the XML header, especially if any extra pseudo-attributes are put in
(no flames please).  

But the http://xml.org/sax/features/validation  cannot be changed during parsing.
See the last paragraph of    SAX2 Standard Feature Flags  at

"Unless otherwise specified here, implementations may support changing current values of 
these standard feature flags, but not while parsing. "

which is also commented on in Brownell's O'Reilly book SAX2 at page 87

Of course, there is an "is-standalone" flag, which may allow some kinds of hacking
around the problem.  Am I completely off-track here: is there some workaround
I am missing?

Rick Jelliffe


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