RE: [xml-dev] Are people really using Identity constraints specif ied in XML schema?

From
Bullard, Claude L (Len) <>
To
"'Hunsberger, Peter'" <>
Date
2004-08-20T14:55:15Z
ID
<>
Thread
RE: [xml-dev] Are people really using Identity constraints specif ied in XML schema?
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:]

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.