Linking attribute value

[Hari7]

Hi All,

I have a Xml document and a Xml Schema document. In xml Schema i have define sum type which i am using to validate XMl Document.

I want to link the attribute value with one another.

As per the below code i want Regionid and regionType should be linked with each other.

For example : In XMl document it should only allow RegionID="ER" and reion="Europe and Russia"

it should not allow other values with reionID="ER" and vice versa.


below is the Code of XMl Schema :


<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="User" minOccurs="0" maxOccurs="6">
<xs:complexType>
<xs:attribute name="region" use="required" type="regiontype"/>
<xs:attribute name="regionId" use="required" type="regionIdtype"/>
</xs:complexType>
</xs:element>
</xs:schema>


<xs:simpleType name="regiontype">
<xs:restriction base="xs:NMTOKENS">
<xs:enumeration value="Europe and Russia"/>
<xs:enumeration value="North America"/>
<xs:enumeration value="Latin and South America"/>
<xs:enumeration value="Africa"/>
<xs:enumeration value="Middle East"/>
<xs:enumeration value="Far East and Australsia"/>
</xs:restriction>
</xs:simpleType>

<xs:simpleType name="regionIdtype">
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="ER"/>
<xs:enumeration value="NA"/>
<xs:enumeration value="LSA"/>
<xs:enumeration value="AF"/>
<xs:enumeration value="ME"/>
<xs:enumeration value="FEA"/>
</xs:restriction>
</xs:simpleType>


XMl Structure :
===============
<?xml version="1.0" encoding="UTF-8"?>
<User regionId="ER" region="Europe and Russia">

</User>

How can i achieve this.

Thanks

-Hari