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• OBSERVABILITY_COLLECTOR_SERVICE_QOS : ServiceQosPolicyKind
• OFFERED_DEADLINE_MISSED_STATUS : StatusKind
• OFFERED_INCOMPATIBLE_QOS_STATUS : StatusKind
• offset : Bytes, KeyedBytes
• old_source_timestamp_dropped_sample_count : DataReaderCacheStatus
• ON_DEMAND_FLOW_CONTROLLER_NAME : FlowController
• ordered_access : PresentationQosPolicy
• ordinal : EnumMember
• original_publication_virtual_guid : SampleInfo
• original_publication_virtual_sequence_number : SampleInfo
• original_related_reader_guid : TopicQueryData
• out_of_range_rejected_sample_count : DataReaderProtocolStatus
• output_file : LoggingQosPolicy
• output_file_suffix : LoggingQosPolicy
• outstanding_asynchronous_sample_allocation : DomainParticipantResourceLimitsQosPolicy
• ownership : PublicationBuiltinTopicData, DataWriterQos, SubscriptionBuiltinTopicData, DataReaderQos, TopicBuiltinTopicData, TopicQos
• ownership_dropped_sample_count : DataReaderCacheStatus
• OWNERSHIP_QOS_POLICY_ID : QosPolicyId_t
• ownership_strength : PublicationBuiltinTopicData, DataWriterQos
• OWNERSHIPSTRENGTH_QOS_POLICY_ID : QosPolicyId_t