description: Required if ParticipantObjectIDTypeCode is (110180, DCM, \"Study Instance UID\") and any of the optional fields (AccessionNumber, ContainsMPPS, NumberOfInstances, ContainsSOPInstances,Encrypted,Anonymized) are present in this Participant Object. May be present if ParticipantObjectIDTypeCode is (110180, DCM, \"Study Instance UID\") even though none of the optional fields are present. package_name: hl7.fhir.r5.core derivation: constraint name: SOPClass type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/auditevent-SOPClass'} index: 1 value: choices: [valueReference] index: 3 valueReference: type: Reference choiceOf: value refers: ['http://hl7.org/fhir/StructureDefinition/ImagingStudy'] index: 4 package_version: 4.5.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/auditevent-SOPClass base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.5.0 required: [valueReference, value]