Basic XMLSchema questions

Alan Santos asantos at
Wed Jan 5 23:50:22 GMT 2000

> There is a widespread need for this functionality, c.f. the Cambridge
> Communique [1].  Schema-internal specification of this information is
> not explicitly supported, except as you say in a general way via
> <appinfo>, in the current PWD.

I'm not familiar with the Cambridge Communique.  The link returned a 404.
After a bit of searching, I was able to find references to it in the list
archives.   The refrences seem very applicable.

Is it possible you mistyped the link?  I'd like to look into it further.

> I THINK what you want is to declare an element or attribute as
> pointing (via a URL, or IDREF, or keyref) to something of a specified
> type.  XML Schema as such does not give you this facility with full
> generality, although the <key>/<keyref> facility can achieve something
> close to this for on-board links.  Validiting such a constraint for
> off-board links is outside the scope of XML Schema in my view.

Yes, this is what I meant.
The key/keyref is a possibility I hadn't explored.

Thanks for the help,

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