KeyRef 

Reference to a key defined in an external column set or code list.

Element Information

Model

Annotation{0,1} , CanonicalUri{0,1} , CanonicalVersionUri , LocationUri*
Children: Annotation, CanonicalUri, CanonicalVersionUri, LocationUri

Attributes

QName Type Fixed Default Use Inheritable Annotation
ExternalRef xsd:token required 
Unique ID of the resource within the external document.
Id xsd:ID required 
Unique ID within the document for the resource.

Source 

<xsd:element name="KeyRef" type="KeyRef">
  <xsd:annotation>
    <xsd:documentation>Reference to a key defined in an external column set or code list.</xsd:documentation>
  </xsd:annotation>
</xsd:element>

Sample