2.2.3.2 unsignedByteOrEmpty Simple Type
The unsignedByteOrEmpty simple type represents a value that can either be an xs:unsignedByte type, as specified in [XMLSCHEMA2/2] section 3.3.24, or an empty value.
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<xs:simpleType name="unsignedByteOrEmpty"> <xs:union memberTypes="xs:unsignedByte EmptyVal"/> </xs:simpleType>