attribute  extRef 
versionV3_0
namespacehttp://www.wipo.int/standards/XMLSchema/ST96/Common
typexsd:token
used by
complexType com:CrossReferenceType
source<xsd:attribute  name="extRef"  type="xsd:token">
<xsd:annotation>
<xsd:documentation>
It represents a reference to an identifier defined in the external document
</xsd:documentation>
</xsd:annotation>
</xsd:attribute>