Restricting the Attribute value in XML Schema

[john2078]

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