{"schema":"omnia.measurement-standards/v1","units":{"primary":"UCUM","semanticModel":"QUDT","policy":"Every numeric observation declares a quantity kind and unit; dimensionless and arbitrary scales remain explicit."},"provenance":{"primary":"W3C PROV-O","policy":"Every observation identifies its source entity, generating activity, responsible agent, and derivation."},"sensorApi":"OGC SensorThings API 1.1","healthApi":"HL7 FHIR Observation R5","timeSync":"Lab Streaming Layer-compatible clock-offset metadata","audio":["ITU-R BS.1770-5","EBU R128 v5"],"evidenceClasses":["observed_physical","derived_signal","inferred_expression","interpretive_mapping"]}