- https://purl.semanticip.org/linked-data/sdmx/ML/usage
TTL - owl:DatatypeProperty
- usage
- localElement
The usage attribute indicates whether an attribute value must be available for any corresponding existing observation.
- SDMXStructureDataStructure.xsd
<xs:attribute name="usage" type="UsageType" use="optional" default="optional">...</xs:attribute>
- sip-sdmx-ML:UsageType