existence of 'ref' attribute, value constraints

[Mark Brucks]

There seems to be no way within the API to determine if the 'ref' 
attribute exists on an <attribute> element information item.  This is 
important, because the value constraints are absent on the Attribute 
Declaration Schema Component when the 'ref' attribute is absent (they 
must come from the Attribute Use Schema Component).  Actually, I guess 
the problem is really that  when the 'ref' attribute exists, there are 
two sets of value constraints, one from the Attribute Use Schema 
Component and one from the global Attribute Declaration Schema Component 
(for the referenced attribute).  Are these the same value constraints, 
and if so why are they duplicated?  My confusion stems from section 
3.2.2 of XML Schema Part 1.

On a somewhat related note, how do you determine if the value of the 
'use' attribute is 'optional' vs. 'prohibited'?  There is the 
"getRequired()" method on XSAttributeUse, but that method returns false 
if either the use attribute is absent or it's value is not 'required'. 
As such, there is no way using the interface API definitions to 
distinguish between the values of 'optional' and 'prohibited'.  Of 
course, since the fUse member of XSAttributeUseImpl is public, I can 
look at it, but I'd rather have a way through one of the public methods 
of XSAttributeUse.

Thanks - Mark Brucks

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