schema augmentation?

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schema augmentation?

isil light
 
We have a schema that validates the following elements:


<DateTime>
 <Date>20051017</Date>
 <Time>230001</Time>
</DateTime>

DateTime must contain one Date and one Time element
Date must match a pattern
Time must match a pattern


We have a client who wishes to add to our definition of the DateTime element:

<DateTime>
 <Date>20051017</Date>
 <Time>230001</Time>
 <Zone>EST</Zone>
</DateTime>


Can this be done with schema without the client altering our schema?
Could this be done with namespaces?




<DateTime xmlns="local">
 <Date>20051017</Date>
 <Time>230001</Time>
</DateTime>



<DateTime xmlns="client">
 <Date>20051017</Date>
 <Time>230001</Time>
 <Zone>EST</Zone> <!-- the client xsd would simply augment the local xsd -->
</DateTime>


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