Optical Medium http://www.snik.eu/ontology/bb/OpticalMedium meta:chapter bb:chapter6-6↪ Physical Tool Layer: Physical Data-Processing Systems rdf:type meta:EntityType↪ entity type rdfs:label Optical Medium @en رسانه نوری @fa rdfs:subClassOf bb:PhysicalDataProcessingSystem↪ Physical Data Processing System bb:StorageMedium↪ Storage Medium inverse relations is ov:defines of sniko:bb↪ Health Information Systems Ontology