Restricting attribute value in XMl Schema

nelly78 · October 20th, 2009, 10:05 AM

Hi All,
I have an XMl structure and i am creating XML Schema document for validating xml document.
What i want that for a particular element it should not allow same attribute name.
for example below is the XML structure :
<News>
<Regional>
<Report Region="Asia">
<Title></Title>
<Story></Story>
</Report>
</Regional>
</News>
What i want in Xml Schema how can i restrict that in the "Region" Attribute of elemet <Report> value "Asia" occure only once. It should not allow two <Report> element with the value "Asia" in Region Attribute.
Thanks for the help
-John

Martin Honnen · October 20th, 2009, 10:13 AM

If you do not want to allow two Report elements with the same Region attribute value in general then you can define a unique constraint e.g.

Code:

<xs:element name="Regional">
   <xs:complexType>
     <xs:sequence maxOccurs="unbounded">
        <xs:element name="Report">
           ...
        </xs:element>
     </xs:sequence>
  </xs:complexType>
  <xs:unique name="unique-region">
     <xs:selector xpath="Report"/>
     <xs:field xpath="@Region"/>
  </xs:unique>
</xs:complexType>

nelly78 · October 20th, 2009, 10:55 AM

Thanks Martin, Its working ...

nelly78 · October 20th, 2009, 10:56 AM

Thanks Martin, Its working.