3.18. QoS Mapping in XML

QOS definitions in XML are based on the “standard” mapping of QOS policy names and members as found in the Connext Micro documentation, plus the following additional members that are parsed by RTI MAG:

3.18.1. Domain Participant Qos QoS Mapping

The following mapping documents the currently implemented MAG behavior for domain_participant_qos conversion that are additional to what Micro supported.

General behavior:

• Tags present in Pro XML but not supported by Micro are ignored by MAG.

• MAG emits a warning when unsupported fields are encountered.

• Some fields are accepted by parser/validation, but only a subset is emitted into generated Micro configuration.

3.18.1.1. discovery_config

Pro XML tag	MAG behavior	Micro target
builtin_discovery_plugins	Selects discovery kind (DPDE or DPSE)	Discovery component type
participant_liveliness_lease_duration	Consumed	DPDE/DPSE discovery property
participant_liveliness_assert_period	Consumed	DPDE/DPSE discovery property
initial_participant_announcements	Consumed	DPDE/DPSE discovery property
max_initial_participant_announcement_period or min_initial_participant_announcement_period	Consumed (one announcement period value is selected)	DPDE/DPSE discovery property
participant_message_reader_reliability_kind	Consumed	DPDE/DPSE discovery property
max_participant_locators	Consumed	DPDE/DPSE discovery property
max_locators_per_discovered_participant	Consumed	DPDE/DPSE discovery property
cache_serialized_samples	Consumed for DPDE	DPDE discovery property
subscription_reader_resource_limits.max_samples	Consumed for DPDE	max_samples_per_builtin_endpoint_reader
subscription_reader_resource_limits.max_samples_per_remote_writer or publication_reader_resource_limits.max_samples_per_remote_writer or participant_reader_resource_limits.max_samples_per_remote_writer	Consolidated to one Micro value (maximum, with unlimited handling)	max_samples_per_remote_builtin_endpoint_writer
publication_writer.heartbeat_period	Consumed for DPDE	builtin_writer_heartbeat_period
publication_writer.max_heartbeat_retries	Consumed for DPDE	builtin_writer_max_heartbeat_retries
publication_writer.heartbeats_per_max_samples	Consumed for DPDE	builtin_writer_heartbeats_per_max_samples
subscription_reader.nack_period	Consumed for DPDE	builtin_endpoint_reader_nack_period

3.18.1.2. default_unicast

Pro XML tag	MAG behavior	Micro target
default_unicast.value[].transports (+ optional receive_port)	Converted into participant user-traffic transport/address entries	user_traffic.enabled_transports

Note

• Transport names are normalized to internal/default names.

• If no explicit user traffic is configured, MAG may populate Micro defaults (for example, UDPv4 and INTRA when available).

3.18.1.3. resource_limits

Pro XML tag	MAG behavior	Micro target
*_allocation.max_count (for participant resource allocations)	Consumed	Corresponding Micro participant resource limits field
*_allocation.initial_count	Ignored for Micro	None
*_allocation.incremental_count	Ignored for Micro	None

Note

For allocation_settings, max_count is the only value used by Micro.

3.18.2. Domain Participant Factory Qos QoS Mapping

The following mapping documents the currently implemented MAG behavior for domain_participant_factory_qos conversion.

3.18.2.1. Top-level fields

Pro XML tag	MAG behavior	Micro target
entity_factory.autoenable_created_entities	Consumed	Factory entity factory QoS
resource_limits.max_participants	Consumed (and auto-raised if needed)	system_resource_limits.max_participants
resource_limits.max_components	Consumed (and auto-raised if needed)	system_resource_limits.max_components
base_name / base_names	Used for QoS inheritance/profile resolution	Not emitted as a Micro runtime QoS field
logging	Ignored for Micro	None
monitoring	Ignored for Micro	None

3.18.2.2. Nested resource_limits (systemResourceLimitsQosPolicy)

Pro XML tag	MAG behavior	Micro target
resource_limits.max_participants	Consumed	system_resource_limits.max_participants
resource_limits.max_components	Consumed	system_resource_limits.max_components

Note

• Unsupported factory QoS fields are warned and ignored by MAG.

• For this nested policy, MAG uses the two fields listed above.

3.18.3. Publisher QoS mapping

The following mapping documents the currently implemented MAG behavior for publisher_qos conversion.

3.18.3.1. Top-level fields

Pro XML tag	MAG behavior	Micro target
base_name / base_names	Used for QoS inheritance/profile resolution	Not emitted as a Micro runtime QoS field
entity_factory.autoenable_created_entities	Consumed	DDS_PublisherQos::entity_factory.autoenable_created_entities
presentation	Ignored for Micro — MAG emits a warning	None
partition.name	Consumed — partition strings emitted as a const char* array	DDS_PublisherQos::partition.name
group_data.value	Consumed — octet bytes emitted as a DDS_Octet array	DDS_PublisherQos::group_data.value
publisher_name.name	Consumed	DDS_PublisherQos::publisher_name.name
asynchronous_publisher	Ignored for Micro — MAG emits a warning	None

Note

• Fields not in the supported set cause MAG to emit a warning and reset the field to its default value.

• partition.name and group_data.value are also referenced in generated remote-publication-data structs (entities.h) for DPDE discovery matching.

• publisher_name.name is used both in the generated QoS initializer macro and as part of remote publication data struct naming.

3.18.4. Subscriber QoS mapping

The following mapping documents the currently implemented MAG behavior for subscriber_qos conversion.

3.18.4.1. Top-level fields

Pro XML tag	MAG behavior	Micro target
base_name / base_names	Used for QoS inheritance/profile resolution	Not emitted as a Micro runtime QoS field
entity_factory.autoenable_created_entities	Consumed	DDS_SubscriberQos::entity_factory.autoenable_created_entities
presentation.access_scope	Consumed	DDS_SubscriptionBuiltinTopicData::presentation.access_scope
presentation.coherent_access	Consumed	DDS_SubscriptionBuiltinTopicData::presentation.coherent_access
presentation.ordered_access	Consumed	DDS_SubscriptionBuiltinTopicData::presentation.ordered_access
partition.name	Consumed	DDS_SubscriberQos::partition.name
group_data.value	Consumed	DDS_SubscriberQos::group_data.value
subscriber_name.name	Consumed	DDS_SubscriberQos::subscriber_name.name

Note

• Fields not in the supported set cause MAG to emit a warning and reset the field to its default value.

• presentation.* is consumed when generating remote subscription data (entities.h) and is not part of the local DDS_SubscriberQos initializer macro.

• partition.name and group_data.value are used in both the local subscriber QoS initializer macro and generated remote subscription data.

3.18.5. Topic QoS mapping

The following mapping documents the currently implemented MAG behavior for topic_qos conversion.

3.18.5.1. Top-level fields

Pro XML tag	MAG behavior	Micro target
base_name / base_names	Used for QoS inheritance/profile resolution	Not emitted as a Micro runtime QoS field
topic_data.value	Consumed	DDS_TopicQos::topic_data.value and built-in topic-data payload in generated remote endpoint data
durability.*	Consumed only when topic_qos is used as a base for datawriter_qos / datareader_qos	Inherited into DDS_DataWriterQos::durability / DDS_DataReaderQos::durability
deadline.period.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::deadline / DDS_DataReaderQos::deadline
latency_budget.duration.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::latency_budget / DDS_DataReaderQos::latency_budget
liveliness.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::liveliness / DDS_DataReaderQos::liveliness
reliability.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::reliability / DDS_DataReaderQos::reliability
destination_order.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::destination_order / DDS_DataReaderQos::destination_order
history.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::history / DDS_DataReaderQos::history
resource_limits.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::resource_limits / DDS_DataReaderQos::resource_limits
ownership.kind	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::ownership / DDS_DataReaderQos::ownership
representation.value and representation.compression_settings.*	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::representation / DDS_DataReaderQos::representation
transport_priority.value	Consumed only through Topic->Writer/Reader QoS inheritance	Inherited into DDS_DataWriterQos::transport_priority / DDS_DataReaderQos::transport_priority
durability_service.*	Not consumed by MAG for Topic QoS conversion	None
lifespan.duration.*	Not consumed by MAG for Topic QoS conversion	None

Note

• Unlike participant/publisher/subscriber QoS conversion, Topic QoS does not use a dedicated unsupported-field warning set in ConverterUtils; unsupported Topic members that are not mapped above remain effectively unused.

• Topic QoS local macro generation (topicQos in qos.h.vm) emits only management data and topic_data.

• Additional Topic fields become effective only when a DataWriter/DataReader inherits from a Topic QoS profile, via QosUtils.inheritFromTopicQos(...).

3.18.6. DataReader QoS mapping

The following mapping documents the currently implemented MAG behavior for datareader_qos conversion.

3.18.6.1. Top-level fields

Pro XML tag	MAG behavior	Micro target
base_name / base_names	Used for QoS inheritance/profile resolution	Not emitted as a Micro runtime QoS field
durability.kind	Consumed	DDS_DataReaderQos::durability.kind
durability.direct_communication, durability.storage_settings.*	Ignored for Micro - MAG emits warnings	None
deadline.period.sec/nanosec	Consumed	DDS_DataReaderQos::deadline.period
liveliness.kind, liveliness.lease_duration.*	Consumed	DDS_DataReaderQos::liveliness
reliability.kind, reliability.max_blocking_time.*	Consumed	DDS_DataReaderQos::reliability
reliability.acknowledgment_kind, reliability.instance_state_consistency_kind, reliability.exact_reliability_kind_match	Ignored for Micro - MAG emits warnings	None
destination_order.kind, destination_order.source_timestamp_tolerance.*	Consumed	DDS_DataReaderQos::destination_order
history.kind, history.depth	Consumed	DDS_DataReaderQos::history
resource_limits.max_samples, resource_limits.max_instances, resource_limits.max_samples_per_instance	Consumed	DDS_DataReaderQos::resource_limits
resource_limits.* (other members)	Ignored for Micro - MAG emits warnings	None
ownership.kind	Consumed	DDS_DataReaderQos::ownership.kind
representation.value.element[]	Consumed	DDS_DataReaderQos::representation.value
representation.compression_settings.*	Ignored for Micro - MAG emits warnings	None
latency_budget.duration.sec/nanosec	Consumed	DDS_DataReaderQos::latency_budget.duration
user_data.value	Consumed	DDS_DataReaderQos::user_data.value
transport_priority.value	Consumed	DDS_DataReaderQos::transport_priority.value
reader_resource_limits.max_remote_writers, max_remote_writers_per_instance, max_samples_per_remote_writer, max_outstanding_reads, max_routes_per_writer, max_fragmented_samples, max_fragmented_samples_per_remote_writer, shmem_ref_transfer_mode_attached_segment_allocation.max_count	Consumed	DDS_DataReaderQos::reader_resource_limits corresponding fields
reader_resource_limits.instance_replacement.alive_instance_removal, disposed_instance_removal, no_writers_instance_removal	Consumed	DDS_DataReaderQos::reader_resource_limits.instance_replacement
reader_resource_limits.* (other members)	Ignored for Micro - MAG emits warnings	None
protocol.rtps_object_id, protocol.rtps_reliable_reader.nack_period.*, protocol.propagate_dispose_of_unregistered_instances	Consumed	DDS_DataReaderQos::protocol corresponding fields
protocol.* (other members)	Ignored for Micro - MAG emits warnings	None
subscription_name.name	Consumed	DDS_DataReaderQos::subscription_name.name
unicast.value[].transports[] + optional receive_port	Converted and consumed	DDS_DataReaderQos::transport.enabled_transports (internal micro transport list)
multicast.value[].transports[] + optional receive_address/receive_port	Converted and consumed	DDS_DataReaderQos::transport.enabled_transports (internal micro transport list)
time_based_filter, reader_data_lifecycle, type_consistency, data_tags, transport_selection, property, availability, service, type_support	Ignored for Micro - MAG emits warnings	None
topic_filter (attribute)	Parsed for profile/topic matching behavior only	Not emitted as a runtime QoS struct field

Note

• Unsupported fields are detected by ConverterUtils against VALID_DATA_READER_POLICIES; MAG warns and ignores unsupported values.

• unicast and multicast are normalized into microTransports.enabledTransports by SystemModelProducer.addEnabledTransports(...); the template emits the resulting transport list.

• content_filter is configured from the data_reader entity-level filter (not a direct datareader_qos XML member) and is emitted through contentFilterQosPolicy.

• property is intentionally not emitted for DataReader QoS in current templates (propertiesQosPolicy( $null, ...)).

3.18.7. DataWriter QoS mapping

The following mapping documents the currently implemented MAG behavior for datawriter_qos conversion.

3.18.7.1. Top-level fields

Pro XML tag	MAG behavior	Micro target
base_name / base_names	Used for QoS inheritance/profile resolution	Not emitted as a Micro runtime QoS field
durability.kind	Consumed	DDS_DataWriterQos::durability.kind
durability.direct_communication, durability.storage_settings.*	Ignored for Micro - MAG emits warnings	None
deadline.period.sec/nanosec	Consumed	DDS_DataWriterQos::deadline.period
liveliness.kind, liveliness.lease_duration.*	Consumed	DDS_DataWriterQos::liveliness
reliability.kind, reliability.max_blocking_time.*	Consumed	DDS_DataWriterQos::reliability
reliability.acknowledgment_kind, reliability.instance_state_consistency_kind, reliability.exact_reliability_kind_match	Ignored for Micro - MAG emits warnings	None
destination_order.kind, destination_order.source_timestamp_tolerance.*	Consumed	DDS_DataWriterQos::destination_order
history.kind, history.depth	Consumed	DDS_DataWriterQos::history
resource_limits.max_samples, resource_limits.max_instances, resource_limits.max_samples_per_instance	Consumed	DDS_DataWriterQos::resource_limits
resource_limits.* (other members)	Ignored for Micro - MAG emits warnings	None
ownership.kind	Consumed	DDS_DataWriterQos::ownership.kind
ownership_strength.value	Consumed	DDS_DataWriterQos::ownership_strength.value
representation.value.element[]	Consumed	DDS_DataWriterQos::representation.value
representation.compression_settings.*	Ignored for Micro - MAG emits warnings	None
latency_budget.duration.sec/nanosec	Consumed	DDS_DataWriterQos::latency_budget.duration
user_data.value	Consumed	DDS_DataWriterQos::user_data.value
transport_priority.value	Consumed	DDS_DataWriterQos::transport_priority.value
writer_resource_limits.max_remote_readers, max_routes_per_reader, writer_loaned_sample_allocation.max_count, initialize_writer_loaned_sample, max_remote_reader_filters	Consumed	DDS_DataWriterQos::writer_resource_limits corresponding fields
writer_resource_limits.* (other members)	Ignored for Micro - MAG emits warnings	None
protocol.rtps_object_id, protocol.rtps_reliable_writer.heartbeat_period.*, protocol.rtps_reliable_writer.heartbeats_per_max_samples, protocol.rtps_reliable_writer.max_send_window_size, protocol.rtps_reliable_writer.max_heartbeat_retries	Consumed	DDS_DataWriterQos::protocol corresponding fields
protocol.serialize_on_write	Not configurable from XML for MAG writer path	Always emitted as true by template
publication_name.name	Consumed	DDS_DataWriterQos::publication_name.name
unicast.value[].transports[] + optional receive_port	Converted and consumed	DDS_DataWriterQos::transport.enabled_transports (internal micro transport list)
publish_mode.kind, publish_mode.flow_controller_name, publish_mode.priority	Consumed (with flow-controller name validation/normalization)	DDS_DataWriterQos::publish_mode
transfer_mode.shmem_ref_settings.enable_data_consistency_check	Consumed	DDS_DataWriterQos::transfer_mode.shmem_ref_settings.enable_data_consistency_check
property.value[]	Partially consumed	DDS_DataWriterQos::property.value for Micro-supported property names only
transport_selection, type_support, durability_service, lifespan, writer_data_lifecycle, data_tags, batch, service, multi_channel, availability, topic_query_dispatch	Ignored for Micro - MAG emits warnings	None
topic_filter (attribute)	Parsed for profile/topic matching behavior only	Not emitted as a runtime QoS struct field

Note

• Unsupported fields are detected by ConverterUtils against VALID_DATA_WRITER_POLICIES; MAG warns and ignores unsupported values.

• unicast is normalized into microTransports.enabledTransports by SystemModelProducer.addEnabledTransports(...); the template emits the resulting transport list.

• publish_mode.flow_controller_name is validated by checkFlowController(...); built-in names are accepted directly, and custom names must use the expected prefix and be backed by participant properties.

• property is emitted only for names in VALID_PROPERTIES_TO_GENERATE (via QosUtils.microProperties(...)); other property entries are not emitted into generated C QoS structures.

3.18.8. Structural elements mapping

The following mapping documents the structural (non-QoS) elements from the application configuration schema and how MAG processes them.

3.18.8.1. filter and content_filter (DataReader element)

These define content-based filtering for DataReader subscriptions.

Schema element	MAG behavior	Notes
filter (deprecated)	Parsed and migrated to content_filter with warning	If both filter and content_filter are present, MAG emits an error
content_filter.kind	Parsed and validated; only builtin.sql is supported	MAG error if kind is not builtin.sql or null
content_filter.expression	Consumed (SQL filter expression string)	Emitted into generated remote-endpoint discovery structs
content_filter.parameter_list (deprecated)	Parsed and migrated to expression_parameters with warning	If both are present, MAG emits an error
content_filter.expression_parameters.element[]	Consumed (parameter string array)	Emitted alongside filter expression for runtime substitution

Processing:

• ConverterUtils.checkContentFilter(...) handles deprecation migration and validation

• Content filter metadata is emitted in entities.h remote data structures via contentFilterProperty(...) macro

• Content filter resource limits are configured via DomainParticipantFactoryQos.filter_qos_policy properties

• CFT constants: CFT_DISABLE_WRITER_FILTERING, CFT_DISABLE_BUILTIN_SQL_FILTER, CFT_FILTER_CLASS_MAX_LENGTH, CFT_FILTER_EXPRESSION_MAX_LENGTH, etc.

3.18.8.2. register_type (Domain and Participant element)

Type registration defines how data types are bound to topics.

Schema element	MAG behavior	Micro target
name (required)	Consumed as type identifier	Stored in RegisterTypeModel.name
registered_name	Consumed; defines the type’s global name	Stored in RegisterTypeModel.registeredName
type_ref (required)	Resolved against type definitions; used for type plugin lookup	Stored in RegisterTypeModel.typeRef

Processing:

• All register_type elements are parsed into RegisterTypeModel objects and stored in DomainParticipantModel.registerTypes

• Type reference resolution occurs in SystemModelProducer.findRegisterTypeModel(...) by matching name or registered_name against registered types in the domain

• Templates emit type plugin getters via typePlugin() and typePluginCPP() macros (utils.vm), which select between registeredName and typeRef for plugin resolution

• If a topic references a type that cannot be resolved, MAG emits an error

3.18.8.3. multiplicity (Publisher, Subscriber, DataWriter, DataReader attribute)

The multiplicity attribute specifies how many instances of an entity to generate.

Schema attribute	MAG behavior	Default value
multiplicity	Consumed as positive integer; used for resource allocation calculations	1

Processing:

• SystemModelProducer reads multiplicity from Publisher (line 2715), Subscriber (line 2905), DataWriter (line 2805), and DataReader (line 3003)

• ResourceLimitsUpdater uses multiplicity to calculate cumulative resource allocations:

  • Publisher.multiplicity * DataWriter count → total writer allocation

  • Subscriber.multiplicity * DataReader count → total reader allocation

• Each multiplied instance receives a unique name suffix in generated code

3.18.8.4. base_name and base_names (QoS profile inheritance)

These attributes enable profile inheritance and composition chains.

Schema element	MAG behavior	Notes
base_name	Parsed as QoS profile reference (single inheritance)	Format: LibraryName::ProfileName
base_names.element[]	Parsed as QoS profile reference chain (composition inheritance)	Multiple profiles resolved in order

Processing:

• Both are handled by QosUtils.getBaseName(...) and QosUtils.getBaseNames(...) during QoS resolution

• Format validation: base names must follow LibraryName::ProfileName format (checked in QosUtils.getBaseNamesList(...))

• QosUtils.resolveNonProfileQos(...) performs recursive inheritance: merges base QoS values with current QoS, with current values overriding inherited ones

• Library prefix is automatically added by QosUtils.addLibraryNameToBaseName(...) for relative profile references

• Invalid or unresolved base names generate errors during QoS resolution

3.18.8.5. topic (Domain element)

Topic definitions bind a data type to a topic name with optional QoS.

Schema element	MAG behavior	Micro target
name (attribute)	Consumed as topic identifier within domain	Topic name used in datawriter_qos/datareader_qos topic references
registered_name (child element)	Alternative topic name if name attribute not set	Stored as topic’s display/registered name
register_type_ref (attribute, required)	Resolved against registered types to bind topic to data type	Type plugin lookup
topic_qos (child element)	Parsed as optional QoS profile for topic-level defaults	Base QoS for DataWriter/DataReader inheritance

Processing:

• All topics are parsed into TopicModel objects and stored per domain

• SystemModelProducer.findTopicModel(...) resolves topic references by name (matching against name or registered_name)

• Topics are primarily used for QoS composition: when a datawriter_qos or datareader_qos references a topic, inherited fields are merged via QosUtils.inheritFromTopicQos(...)

• If a DataWriter/DataReader references a topic that cannot be resolved, MAG emits an error

• Topic QoS is not directly emitted as a C runtime structure; only the resulting merged QoS (after inheritance) is emitted

3.18.8.6. data_writer (Publisher, Participant element)

DataWriter entity configuration.

Schema element	MAG behavior	Micro target
name (attribute)	Consumed as entity identifier	Unique writer name within publisher
multiplicity (attribute)	Resource allocation multiplier (see multiplicity section above)	Instance count for writer generation
topic_ref (attribute, required)	Resolved against topic definitions in domain	Topic bound to this writer
datawriter_qos (child element)	Parsed as writer-specific QoS profile	Merged with topic QoS and emitted as DDS_DataWriterQos

Processing:

• SystemModelProducer.createDataWriterModel(...) resolves topic references and applies QoS inheritance

• Transport configuration (unicast/multicast) and publish-mode flow-controller validation occur during creation

• Multiplicity is used by ResourceLimitsUpdater to calculate writer allocation counts

3.18.8.7. data_reader (Subscriber, Participant element)

DataReader entity configuration, including optional content filtering.

Schema element	MAG behavior	Micro target
name (attribute)	Consumed as entity identifier	Unique reader name within subscriber
multiplicity (attribute)	Resource allocation multiplier (see multiplicity section above)	Instance count for reader generation
topic_ref (attribute, required)	Resolved against topic definitions in domain	Topic subscribed by this reader
content_filter or filter (child element)	Parsed for content-filtering configuration (see filter section above)	CFT metadata in remote endpoint data
datareader_qos (child element)	Parsed as reader-specific QoS profile	Merged with topic QoS and emitted as DDS_DataReaderQos

Processing:

• SystemModelProducer.createDataReaderModel(...) resolves topic references, applies QoS inheritance, and validates content filters

• ConverterUtils.checkContentFilter(...) is called to validate and migrate filter elements

• Multiplicity is used by ResourceLimitsUpdater to calculate reader allocation counts

• Content-filter configuration gates the DomainParticipantFactory’s CFT feature flag: if any reader has a content filter, isContentFilter() returns true

3.18.8.8. publisher (Participant element)

Publisher entity container for DataWriters.

Schema element	MAG behavior	Micro target
name (attribute)	Consumed as entity identifier	Unique publisher name within participant
multiplicity (attribute)	Resource allocation multiplier (see multiplicity section above)	Instance count for publisher generation
publisher_qos (child element)	Parsed as publisher-specific QoS profile	Emitted as DDS_PublisherQos
data_writer (child elements)	Each DataWriter is processed independently	Collection of writers created for this publisher

Processing:

• SystemModelProducer.createPublisherModel(...) creates a PublisherModel and processes child DataWriters

• Publisher multiplicity scales the total number of publishers generated; each multiplied instance receives a unique suffix

3.18.8.9. subscriber (Participant element)

Subscriber entity container for DataReaders.

Schema element	MAG behavior	Micro target
name (attribute)	Consumed as entity identifier	Unique subscriber name within participant
multiplicity (attribute)	Resource allocation multiplier (see multiplicity section above)	Instance count for subscriber generation
subscriber_qos (child element)	Parsed as subscriber-specific QoS profile	Emitted as DDS_SubscriberQos
data_reader (child elements)	Each DataReader is processed independently	Collection of readers created for this subscriber

Processing:

• SystemModelProducer.createSubscriberModel(...) creates a SubscriberModel and processes child DataReaders

• Subscriber multiplicity scales the total number of subscribers generated; each multiplied instance receives a unique suffix

3.18.8.10. domain_participant (ParticipantLibrary element)

Top-level DomainParticipant configuration.

Schema element	MAG behavior	Micro target
name (attribute)	Consumed as entity identifier	Participant name prefix for generated code
domain_ref (attribute, optional)	Resolved against domain library	Binds participant to a specific domain
domain_id (attribute, optional)	Domain ID override (overrides domain_ref domain ID)	Runtime participant domain ID
base_name (attribute, optional)	Participant profile inheritance (not directly used for structure)	QoS inheritance base
domain_participant_qos (child element)	Parsed as participant-specific QoS profile	Emitted as DDS_DomainParticipantQos
register_type (child elements)	Type registrations local to this participant	Stored in participant model; supersede domain registrations
topic (child elements)	Topics local to this participant	Stored in participant model; supersede domain topics
publisher / subscriber (child elements)	Publishers and subscribers for this participant	Processed recursively
data_writer / data_reader (child elements)	Implicit publisher/subscriber writers and readers	Processed with implicit entity creation

Processing:

• SystemModelProducer.createParticipantModel(...) recursively processes all child entities

• Resource limits are calculated and adjusted by ResourceLimitsUpdater based on entity multiplicities and nesting

• Discovery configuration (DPSE or built-in) determines which metadata types are emitted in generated code

3.18.8.11. domain (DomainLibrary element)

Domain definition containing topic and type registrations.

Schema element	MAG behavior	Micro target
name (attribute)	Consumed as domain identifier within library	Domain reference for participants
domain_id (attribute, optional)	Domain ID for this domain	Runtime domain ID if not overridden
base_name (attribute, optional)	Domain profile inheritance	QoS inheritance base
register_type (child elements)	Type registrations available to all participants in domain	Global type registry
topic (child elements)	Topics available to all participants in domain	Global topic registry

Processing:

• Domains provide a namespace for types and topics

• Participant domain references resolve to this domain during initialization

• All register types and topics in a domain are merged into participant-local registries; participant-local definitions override domain definitions

3.18.8.12. domain_library and participant_library (Root elements)

Top-level containers for domains and participants.

Schema element	MAG behavior	Micro target
name (attribute)	Library namespace; used in base_name resolution	Automatically prepended to profile references
domain (child elements, in domain_library)	Domain definitions	Processed in order
domain_participant (child elements, in participant_library)	Participant configurations	Processed in order; code generation targets all participants

Processing:

• Multiple domain and participant libraries can be defined

• Library names are prepended to base_name references by QosUtils.addLibraryNameToBaseName(...)

• All participants across all participant libraries are code-generated unless filtering is applied