ensuring that one of three separate elements contains data

[ikdevelop]

Hi,
i have never had the need to write an XML Schema until now. and for the purposes of my web service i have got one alomst complete and the code to validate it. But, i have one problem which i am not sure how to solve.
A submitted XML doc (or string) to my web service must have at least one customer contact number, and i am not sure how to validate this.
At the moment my schema has the 3 possible contact numbers as separate elements. e.g.

<xs:element name="HomeNumber" type="xs:string"/>
<xs:element name="WorkNumber" type="xs:string"/>
<xs:element name="MobileNumber" type="xs:string"/>

but i am not sure how to say in the schema: 'one of this set of elements must contain data'.

If someone could help me out with how to best achieve this, i would be most appreciative.


Cheers
ik

 

[Kalisto]

if you want only one of the 3, try the choice element

<xs:element name="contactnumber">
  <xs:complexType>
    <xs:choice>
      <xs:element name="HomeNumber" type="xs:string"/>
      <xs:element name="WorkNumber" type="xs:string"/>
      <xs:element name="MobileNumber" type="xs:string"/>
    </xs:choice>
  </xs:complexType>
</xs:element>

K