how to choose only one of the three existing elements in XSD

[vamshidhar nimbagiri]

Hi

I have follwing XSD which contains three elements i.e., RID, BID and KID of which only one of
them should present and remaing are optional.
Could any body please tell me how to achieve this

<xs:element name="CustomerCode">
<xs:complexType>
<xs:sequence>
<xs:element name="RID">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="[A-Z0-9]{15}" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="BID">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="[A-Z0-9]{15}" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="KD">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="[A-Z0-9]{15}" />
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>


Thanks in advance

Vamshi

[vamshidhar nimbagiri]

Thanks guys i got the answer
by using <xs:choice