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> If the Infoset were an API, I would absolutely agree with
> you. The DOM
> *is* an API, and has the same lack of rules, which is one
> reason why it's a poor API, as we both know. But the Infoset
> is only an abstract data model, and it doesn't need to
> enforce well-formedness rules. It's just a way of talking
> about what it is that concrete APIs and other processes have
> or make available.
A good abstract data model would certainly define a set of integrity
constraints, and I would expect a good abstract data model for XML to
include constraints such as "an element cannot have two attributes with
the same name".