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Element structure constraint based on attribute value

From: "Duarte S" <flintswing@-----.--->
To: NULL
Date: 1/5/2007 9:30:00 AM

Hi,
Is it possible, in a W3C schema, to constraint the structure of
elements based on attribute values? For example:

<instr type="sql" instruction="SELECT * ....." />
<instr type="exec" command="C:/work.bat" parameters="/p /s" />

In this example, the attribute 'type' is allways present, however the
other attributes depend on the value of the 'type' attribute
('instruction' is only present if type="sql", etc...). Is it possible
to apply such a constraint within a W3C Schema?

I've read in another topic that this kind of constraint could be made
with a Schematron Schema. If so, is it possible to do a W3C Schema with
embedded Schematron rules? How are these rules applied?

Thanks

Duarte



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