• To: "'Hunsberger, Peter'" <Peter.Hunsberger@S...>
• Subject: RE: Are people really using Identity constraints specified in XML schema?
• From: "Bullard, Claude L (Len)" <len.bullard@i...>
• Date: Fri, 20 Aug 2004 09:55:15 -0500
• Cc: xml-dev@l...

Aha.  I think the schema is precisely context aware but 
it cannot change the context it can be aware of.  As I 
said to David, it can tell that something is a thing 
but not the thing.  It can express the intention in 
some detail but it cannot change the intention.

In short, it is not a dynamic assembly mechanism 
because it is not dynamic.

It is a means to determine the fit of the instance 
to the expectation of the receiver.   It cannot 
know that expectation which is why it is referred 
to as a contract.  If used transactionally, it 
requires a priori negotiation.

len


From: Hunsberger, Peter [mailto:Peter.Hunsberger@S...]

Wasn't aware that was the objective (local context predominates)...

However, I think we have a partial answer: schema have no built in
mechanism for context awareness or context resolution.

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