Key 

Contains a technical identifier (like a database primary key, a GUID
...) by opposition to a business oriented value, like a booking reference or a
product code, which are in @Value.

Attribute Information

Used By

Complex Type AtomType

Source 

<xs:attribute name="Key" type="xs:anySimpleType" use="optional">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Contains a technical identifier (like a database primary key, a GUID ...) by opposition to a business oriented value, like a booking reference or a product code, which are in @Value.</xs:documentation>
    <xs:appinfo>DF+2011-04-01+Add: To allow technical key and Value at teh same type and keep the Role to provide semantic information.</xs:appinfo>
  </xs:annotation>
</xs:attribute>

Sample