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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!

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!
>

Stan Kitsis [MSFT] wrote:

> No, XSD does not support this.

SGML does
Well, sorta.

///Peter

Thnx guys for your response