Using Built-in DataType date

[SShetty]

I'm trying to use the XML Schema built-in datatype "date". I get the following message when I try to validate my document:

Message: Type not found in http://www.w3.org/2001/XMLSchema:date

The following is snippet of my schema:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
      ....
      <xs:element name="Date" type="xs:date"/>
      ...
</xs:schema>
      
Please let me know what the problem is.

Thanks.
Sharat Shetty