| Definition | Type | Referenced Entity |
|---|
| amount_of_substance_unit | ENTITY | named_unit |
| attribute_classification_item | SELECT | named_unit |
| attribute_classification_item | SELECT | context_dependent_unit |
| classification_item | SELECT | named_unit |
| classification_item | SELECT | context_dependent_unit |
| conversion_based_unit | ENTITY | named_unit |
| currency | ENTITY | externally_defined_currency |
| currency | ENTITY | named_unit |
| currency_measure_with_unit | ENTITY | currency |
| dependent_instantiable_named_unit | RULE | named_unit |
| derived_unit_element | ENTITY | named_unit |
| derive_dimensional_exponents | FUNCTION | named_unit |
| document_reference_item | SELECT | externally_defined_item |
| electric_current_unit | ENTITY | named_unit |
| externally_defined_dimension_definition | ENTITY | externally_defined_item |
| externally_defined_feature_definition | ENTITY | externally_defined_item |
| externally_defined_item_relationship | ENTITY | externally_defined_item |
| externally_defined_item_with_multiple_references | ENTITY | externally_defined_item |
| external_identification_item | SELECT | externally_defined_item |
| external_identification_item | SELECT | named_unit |
| external_identification_item | SELECT | externally_defined_context_dependent_unit |
| groupable_item | SELECT | named_unit |
| length_unit | ENTITY | named_unit |
| luminous_intensity_unit | ENTITY | named_unit |
| mass_unit | ENTITY | named_unit |
| named_unit | ENTITY | context_dependent_unit |
| organization_item | SELECT | externally_defined_item |
| plane_angle_unit | ENTITY | named_unit |
| ratio_unit | ENTITY | named_unit |
| same_as_item | SELECT | named_unit |
| si_unit | ENTITY | named_unit |
| solid_angle_unit | ENTITY | named_unit |
| subtype_exclusiveness_externally_defined_item | RULE | externally_defined_item |
| subtype_mandatory_externally_defined_item | RULE | externally_defined_item |
| thermodynamic_temperature_unit | ENTITY | named_unit |
| time_unit | ENTITY | named_unit |
| unit | SELECT | named_unit |