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Rob Lugt wrote:
> But having an implicit declaration would create two classes of Validity.
> Existing (non xmlid-conformant parsers) would declare the document invalid
> whereas updated applications would declare it valid.
Validity has been redefined before. For example, it used to be valid
to have two different attributes of type NOTATION on a single element,
but this is now invalid in the name of SGML compatibility. (It was
always *meant* to be invalid, but formal invalidity entered by way of
an erratum.)
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