- https://purl.semanticip.org/linked-data/sdmx/ML/basePeriod
TTL - owl:DatatypeProperty
- basePeriod
- localElement
- SDMXStructureStructureMappings.xsd
<xs:attribute name="basePeriod" type="xs:string" use="required">...</xs:attribute>
- sip-sdmx-ML:EpochMapType
- xsd:string