<xs:simpleType name="DateValueExtensionType">
<xs:annotation>
<xs:appinfo xml:lang="en">Type used to modify the type modeling date to allow "Not Applicable" and "Unknown".</xs:appinfo>
</xs:annotation>
<xs:restriction base="xs:string">
<xs:enumeration value="Not Applicable"/>
<xs:enumeration value="Unknown"/>
</xs:restriction>
</xs:simpleType>
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