usage of "Choice" Compositor with Attributes/attribute

[kosaraju.puneeth]

I want an element that must have either attribute A or B.
<Thing1 A="aaa"/> <Thing1 B="bbb"/>
I want to enforce this in my schema . If A and B were
elements, I could use choice.
<xs:attribute name="A"/>
<xs:attribute name="B"/>
<xs:element name="Thing1">
<xs:complexType>
<xs:choice >
<xs:element ref="A"/>
<xs:element ref="B"/>
</xs:choice>
</xs:complexType>
</xs:element>
But choice only works for elements, and I am stuck.
Is there a way to do "choice" for attributes?
And if so, how about for attributeGroups too?
Making both attributes optional would accept valid input
but not reject all invalid input. I am hoping for better.
Thanks!

[Stan Kitsis [MSFT]]

No, XSD does not support this.

--
Stan Kitsis
Program Manager, XML Technologies
Microsoft Corporation

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I want an element that must have either attribute A or B.
<Thing1 A="aaa"/> <Thing1 B="bbb"/>
I want to enforce this in my schema . If A and B were
elements, I could use choice.
<xs:attribute name="A"/>
<xs:attribute name="B"/>
<xs:element name="Thing1">
<xs:complexType>
<xs:choice >
<xs:element ref="A"/>
<xs:element ref="B"/>
</xs:choice>
</xs:complexType>
</xs:element>
But choice only works for elements, and I am stuck.
Is there a way to do "choice" for attributes?
And if so, how about for attributeGroups too?
Making both attributes optional would accept valid input
but not reject all invalid input. I am hoping for better.
Thanks!

[Peter Flynn]

Stan Kitsis [MSFT] wrote:

No, XSD does not support this.

SGML does :-)
Well, sorta.

///Peter

[kosaraju.puneeth]

Thnx guys for your response :)