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2.20 QueryFieldExpression

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The QueryFieldExpression element specifies a reference to a named value projected from the Instance QueryExpression. The QueryFieldExpression element is of type QueryExpression.

Field: Specifies the name of the value to be retrieved. This element MUST be of type PropertyReference. The Field element MUST be specified and MUST NOT be specified more than once.

Instance: Specifies the QueryExpression from which the value is to be retrieved. The Instance element MUST be specified and MUST NOT be specified more than once.

The following is the XSD for the QueryFieldExpression element.

   <xs:complexType name="QueryFieldExpression">
     <xs:complexContent>
       <xs:extension base="QueryExpression">
         <xs:sequence>
           <xs:element name="Field" type="xs:string" />
           <xs:element name="Instance" type="QueryExpression" />
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>