2.2.3.3 unsignedIntOrEmpty Simple Type
The unsignedIntOrEmpty simple type represents a value that can either be an xs:unsignedInt type, as specified in [XMLSCHEMA2/2] section 3.3.22, or an empty value.
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<xs:simpleType name="unsignedIntOrEmpty"> <xs:union memberTypes="xs:unsignedInt EmptyVal"/> </xs:simpleType>