adding attributes to xml document

[yaronn01]

Hi

I have an XML schema and an instance document I get from a customer.
For example the document can be:

<doc>
<carId>12</carId>
</doc>

And it is valid according to the schema.

I would like to internally annotate this with my attributes:

<doc>
<carId myns:valid="true">12</carId>
</doc>

I would like the annotated document to be valid according to some schema - I don't care which schema, I guess it would be based on the original one.

My question is if there is some way to "extend" the original schema in a new schema without changing it?

I cannot assume anything about the original schema, i.e. it does not necessarily declare that xsd:anyAttribute is allowed on its elements. However maybe attributes from different namespace are always allowed provided that they are valid according their own schema?


Thanks,
Yaron

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