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- From: Digitome Ltd <firstname.lastname@example.org>
- To: email@example.com
- Date: Fri, 11 Apr 1997 17:11:56 +0100 (BST)
>Peter Murray-Rust writes:
> I think I start to understand. By 'structure' you mean the tree structure
> of each DTD? In which case AFs are a way of providing multiple views of the
> same document?
An AF is like a virtual class in OO-speak. HyTime is a bit like a set of
virtual class definitions. From these virtual classes you derive your own
classes (DTDs) that inherit from their super-class(HyTime).
Multiple inheritance is allowwed. That is, a given DTD can inherit from
multiple AF super-classes.
I am on dodgier ground now but I think AF's are virtual rather than pure virtual
classes. I.e. an AF can be a DTD if you want it to.
Hope this helps,
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