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MessageLabs Journal Authors: AppDynamics Blog, RealWire News Distribution, Mike Sweeney, Guy Bunker, Maureen O'Gara

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Re: XIN: XML implicit namespace definitions

> I guess it's because
> so many users use XML parsers which don't consult the external
> DTD subset and work properly only for stand-alone documents.

That, and the one widely deployed (in a web browser) parser that does
fetch external subsets explictly refuses to let you default namespace
declarations (whether they are in an external or internal subset) which
is why for example you can't use the offical xhtml DTD with IE, and why
despite the fact that the xhtml+mathml dtd is mechanically constructed
via xhtml modularisation, I hand edit the thing not to default the xhtml
and mathml namespaces. 


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