ISO 10303-2:2024

Industrial automation systems and integration — Product data representation and exchange — Part 2: Vocabulary

This document specifies the vocabulary for the ISO 10303 series.

Systèmes d'automatisation industrielle et intégration — Représentation et échange de données de produits — Partie 2: Vocabulaire

General Information

• Status: Published
• Publication Date: 05-Feb-2024
• ICS: 01.040.25 - Manufacturing engineering (Vocabularies)
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: ISO/TC 184/SC 4 - Industrial data
• Drafting Committee: ISO/TC 184/SC 4 - Industrial data
• Current Stage: 6060 - International Standard published
• Start Date: 06-Feb-2024
• Due Date: 29-Oct-2023
• Completion Date: 06-Feb-2024

Overview

ISO 10303-2:2024, titled Industrial automation systems and integration - Product data representation and exchange - Part 2: Vocabulary, is an international standard developed by ISO. This document establishes a unified vocabulary for the ISO 10303 series, widely known as STEP (Standard for the Exchange of Product model data). STEP enables consistent, reliable product data representation and exchange across industrial automation systems.

By defining standardized terminology, ISO 10303-2:2024 ensures clear communication and interoperability among diverse stakeholders, including manufacturers, software vendors, and engineers, throughout the product lifecycle. The vocabulary includes terms relevant to data modeling, systems integration, and information exchange in industrial settings.

Key Topics

ISO 10303-2:2024 covers a wide range of topics essential for understanding product data representation and exchange, including:

• General terms used across the ISO 10303 series
• Data modeling languages, including EXPRESS and EXPRESS-X
• SysML terminology for systems modeling
• Standard data access interfaces
• XML representations of product data schemas
• Conformance testing methods to ensure standards compliance
• Product description fundamentals for consistent data definitions
• Geometric and topological representations for 2D and 3D modeling
• Material and engineering properties
• Visual presentation, shape tolerances, and process terminology
• Mathematical concepts relevant to product modeling
• Finite element analysis (FEA) and computational fluid dynamics (CFD) terms
• Procedural and hybrid data representation
• Assembly and product structure vocabulary
• Configuration management
• Quality criteria and inspection schemas

This rich vocabulary supports the precise definition, exchange, and management of product data in automated industrial environments.

Applications

The standardized terminology in ISO 10303-2:2024 delivers significant practical value in various domains:

• Product lifecycle management (PLM): Enables seamless data integration and exchange throughout design, manufacturing, maintenance, and disposal stages.
• Computer-aided design (CAD) and engineering (CAE): Facilitates clear data exchange between software applications using different internal models and structures.
• Industrial automation systems: Improves interoperability between automated production systems, equipment, and digital twins.
• Supply chain collaboration: Supports robust information exchange between partners, contractors, and suppliers using standardized terms, reducing miscommunication and improving data quality.
• Software development: Assists software vendors in implementing tools that read, write, and verify STEP-compliant data formats and schemas.
• Quality assurance and compliance: Provides the vocabulary for specifying conformance testing and ensuring adherence to international product data standards.

By fostering a common understanding, ISO 10303-2:2024 underpins effective digitalization and integration across complex engineering and manufacturing processes.

Related Standards

ISO 10303-2:2024 is a foundational part of the broader ISO 10303 (STEP) series. Several related standards frame the landscape of product data exchange and integration, including:

• ISO 10303-1: Overview and fundamental principles of product data representation and exchange
• ISO 10303-21: Implementation methods for the clear text encoding of product data
• ISO 10303-11: Description methods for the EXPRESS language, used for data modeling
• ISO 10303-28: XML representation of EXPRESS schemas and data
• ISO 10303-239: Product lifecycle support (PLCS)
• ISO 10303-242: Managed model-based 3D engineering (MBD)

Together, these standards ensure effective and reliable product data interoperability, supporting digital transformation and Industry 4.0 initiatives across global industries.

For more information on the ISO 10303 series and related documentation, visit www.iso.org.

Standards Content (Sample)

International
Standard
ISO 10303-2
First edition
Industrial automation systems
2024-02
and integration — Product data
representation and exchange —
Part 2:
Vocabulary
Systèmes d'automatisation industrielle et intégration —
Représentation et échange de données de produits —
Partie 2: Vocabulaire
Reference number
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents
Foreword . xxi
Introduction . xxii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General terms . 1
3.2 Terms related to the EXPRESS language . 27
3.3 Terms related to the EXPRESS-X language . 32
3.4 Terms related to SysML . 33
3.5 Terms related to standard data access interfaces . 33
3.6 Terms related to XML representations of EXPRESS schemas and data . 36
3.7 Terms related to conformance testing methodology and framework . 38
3.8 Terms related to fundamentals of product description and support . 45
3.9 Terms related to geometric and topological representation . 46
3.10 Terms related to foundation representation . 50
3.11 Terms related to product structure, concept and configuration . 50
3.12 Terms related to material and other engineering properties . 52
3.13 Terms related to visual presentation . 52
3.14 Terms related to shape tolerance . 53
3.15 Terms related to process . 53
3.16 Terms related to mathematical concepts . 54
3.17 Terms related to process structure and properties . 58
3.18 Terms related to procedural and hybrid representation. 58
3.19 Terms related to finite element analysis . 59
3.20 Terms related to parameterization and constraints for explicit geometric product
models . 60
3.21 Terms related to mesh-based computational fluid dynamics . 66
3.22 Terms related to elements for the procedural modelling of solid shapes . 67
3.23 Terms related to modelling commands for the exchange of procedurally
represented 2D CAD models . 67
3.24 Terms related to geometrically bounded surface . 67
3.25 Terms related to non-manifold surface . 67
3.26 Terms related to topologically bounded surface . 68
3.27 Terms related to faceted boundary representation . 68
3.28 Terms related to elementary boundary representation . 68
3.29 Terms related to advanced boundary representation . 69
3.30 Terms related to geometric tolerances . 69
3.31 Terms related to domain model . 69
4 ISO 10303 resource entity data types . 72
4.1 action_schema . 72
4.2 application_context_schema . 74
4.3 approval_schema . 76
4.4 basic_attribute_schema . 77
4.5 certification_schema . 78
4.6 contract_schema . 78
iii
4.7 date_time_schema . 78
4.8 document_schema . 81
4.9 effectivity_schema . 82
4.10 experience_schema . 84
4.11 external_reference_schema . 84
4.12 group_schema . 85
4.13 language_schema . 85
4.14 location_schema. 86
4.15 management_resources_schema . 86
4.16 measure_schema . 95
4.17 person_organization_schema. 108
4.18 product_definition_schema . 111
4.19 product_property_definition_schema . 114
4.20 product_property_representation_schema . 116
4.21 qualifications_schema . 118
4.22 security_classification_schema. 118
4.23 configuration_management_schema . 119
4.24 product_concept_schema. 119
4.25 product_structure_schema . 120
4.26 explicit_geometric_constraint_schema . 123
4.27 geometric_model_schema . 126
4.28 geometry_schema . 137
4.29 scan_data_3d_shape_model_schema . 152
4.30 sketch_schema . 154
4.31 topology_schema . 155
4.32 material_property_definition_schema . 160
4.33 material_property_representation_schema . 161
4.34 qualified_measure_schema . 162
4.35 mathematical_context_schema . 164
4.36 mathematical_description_of_distribution_schema . 165
4.37 presentation_appearance_schema . 165
4.38 presentation_definition_schema . 175
4.39 presentation_organization_schema . 181
4.40 presentation_resource_schema . 185
4.41 representation_schema . 188
4.42 shape_aspect_definition_schema . 191
4.43 shape_dimension_schema . 196
4.44 shape_tolerance_schema . 197
4.45 action_and_model_relationships_schema . 203
4.46 aic_advanced_brep . 204
4.47 aic_associative_draughting_elements . 204
4.48 aic_csg . 204
4.49 aic_curve_swept_solid . 204
4.50 aic_draughting_annotation . 205
4.51 aic_draughting_elements . 205
4.52 aic_drawing_structure_and_administration . 208
4.53 aic_edge_based_wireframe. 209
4.54 aic_elementary_brep . 209
4.55 aic_faceted_brep . 209
4.56 aic_geometrically_bounded_2d_wireframe. 209
4.57 aic_geometrically_bounded_surface . 209
4.58 aic_geometrically_bounded_wireframe . 209
4.59 aic_manifold_subsurface . 210
4.60 aic_manifold_surface . 210
iv
4.61 aic_mechanical_design_geometric_presentation . 210
4.62 aic_mechanical_design_shaded_presentation . 210
4.63 aic_non_manifold_surface . 210
4.64 aic_shell_based_wireframe . 211
4.65 aic_topologically_bounded_surface . 211
4.66 analysis_product_relationships_schema . 211
4.67 analysis_schema . 211
4.68 annotated_3d_model_data_quality_criteria_schema . 213
4.69 annotated_3d_model_data_quality_inspection_result_schema . 214
4.70 annotated_3d_model_equivalence_criteria_schema . 215
4.71 annotated_3d_model_equivalence_inspection_result_schema . 217
4.72 assembly_constraint_schema . 218
4.73 assembly_feature_relationship_schema . 219
4.74 basis_schema. 219
4.75 classification_schema . 220
4.76 conditions_schema . 221
4.77 counterbore_countersink_schema . 222
4.78 domain_schema . 226
4.79 draughting_dimension_schema . 226
4.80 draughting_element_schema . 226
4.81 drawing_definition_schema . 229
4.82 equations_schema . 230
4.83 explicit_constraint_schema. 232
4.84 fea_definition_relationships_schema . 232
4.85 fea_scalar_vector_tensor_schema . 234
4.86 finite_element_analysis_control_and_result_schema . 234
4.87 hierarchy_schema . 252
4.88 kinematic_analysis_control_and_result_schema . 253
4.89 kinematic_motion_representation_schema . 254
4.90 kinematic_property_schema . 256
4.91 kinematic_state_schema . 257
4.92 kinematic_structure_schema . 259
4.93 kinematic_topology_schema . 265
4.94 machining_feature_schema . 266
4.95 mathematical_functions_schema . 275
4.96 mechanical_design_schema . 286
4.97 mesh_connectivity_schema . 286
4.98 mesh_function_schema . 287
4.99 mesh_topology_schema . 288
4.100 method_definition_schema . 290
4.101 parameterization_schema . 291
4.102 procedural_sketch_schema . 291
4.103 process_property_representation_schema . 295
4.104 process_property_schema . 296
4.105 product_analysis_schema . 297
4.106 product_and_model_relationships_schema . 298
4.107 product_data_equivalence_criteria_schema . 299
4.108 product_data_equivalence_definition_schema . 300
4.109 product_data_equivalence_inspection_result_schema . 301
4.110 product_data_quality_criteria_schema . 303
4.111 product_data_quality_definition_schema . 305
4.112 product_data_quality_inspection_result_schema . 306
4.113 property_distribution_and_model_relationships_schema . 307
4.114 results_schema . 308
v
4.115 risk_schema . 308
4.116 set_theory_schema . 314
4.117 shape_data_quality_criteria_schema . 315
4.118 shape_data_quality_inspection_result_schema . 330
4.119 solid_shape_element_schema . 333
4.120 state_and_model_relationships_schema . 338
4.121 state_observed_schema . 339
4.122 state_type_schema. 340
4.123 structural_response_definition_schema . 341
4.124 structural_response_representation_schema . 341
4.125 systems_engineering_representation_schema . 358
4.126 topology_based_identification_schema . 360
4.127 variational_representation_schema . 364
5 ISO 10303 application module entity data types and application objects . 365
5.1Ap203_configuration_controlled_3d_design_of_mechanical_parts_and_assemblies_mim. 365
5.2 Ap239_product_life_cycle_support_mim . 367
5.3 Ap242_managed_model_based_3d_engineering_arm. 368
5.4 Ap242_managed_model_based_3d_engineering_mim . 368
5.5 Appearance_assignment_arm . 372
5.6 Colour_arm . 373
5.7 Colour_mim . 374
5.8 Curve_appearance_arm . 374
5.9 Curve_appearance_mim . 375
5.10 Elemental_geometric_shape_arm . 376
5.11 Elemental_topology_arm . 379
5.12 Foundation_representation_arm . 381
5.13 General_surface_appearance_arm . 382
5.14 Layer_assignment_arm . 384
5.15 Layer_assignment_mim . 384
5.16 Date_time_arm . 384
5.17 Person_organization_arm . 385
5.18 Person_organization_mim . 386
5.19 Approval_arm . 386
5.20 Approval_mim . 386
5.21 Person_organization_assignment_arm . 387
5.22 Person_organization_assignment_mim . 387
5.23 Date_time_assignment_arm . 387
5.24 Date_time_assignment_mim . 387
5.25 Security_classification_arm . 388
5.26 Security_classification_mim . 388
5.27 Product_categorization_arm . 388
5.28 Product_identification_arm . 389
5.29 Product_version_arm . 389
5.30 Product_view_definition_arm . 389
5.31 Product_version_relationship_arm . 390
5.32 Identification_assignment_arm . 390
5.33 Identification_assignment_mim . 390
5.34 Part_and_version_identification_arm . 390
5.35 Part_view_definition_arm . 391
5.36 Product_relationship_arm . 391
5.37 Alias_identification_arm . 391
5.38 Assembly_structure_arm . 391
5.39 Contextual_shape_positioning_arm . 392
5.40 Property_assignment_arm . 394
vi
5.41 Shape_property_assignment_arm . 394
5.42 Shape_property_assignment_mim. 395
5.43 External_model_arm . 396
5.44 Independent_property_arm . 396
5.45 Independent_property_representation_arm. 396
5.46 Geometric_validation_property_representation_arm . 396
5.47 Process_property_assignment_arm . 397
5.48 Product_view_definition_relationship_arm . 397
5.49 Work_request_arm . 397
5.50 Work_request_mim. 398
5.51 Work_order_arm . 398
5.52 Work_order_mim. 399
5.53 Certification_arm . 399
5.54 Certification_mim . 399
5.55 Product_replacement_arm . 399
5.56 Activity_arm . 400
5.57 Activity_mim . 400
5.58 Activity_method_arm . 400
5.59 Dimension_tolerance_arm . 400
5.60 Dimension_tolerance_mim . 403
5.61 Geometric_tolerance_arm . 403
5.62 Geometric_tolerance_mim . 412
5.63 Default_tolerance_arm . 412
5.64 Default_tolerance_mim . 413
5.65 Value_with_unit_arm . 413
5.66 Part_definition_relationship_arm . 416
5.67 Part_definition_relationship_mim. 417
5.68 Configuration_item_arm . 417
5.69 Configuration_item_mim . 418
5.70 Effectivity_arm . 418
5.71 Configuration_effectivity_arm . 419
5.72 Effectivity_application_arm . 419
5.73 Effectivity_application_mim . 419
5.74 Product_concept_identification_arm . 420
5.75 Project_arm . 420
5.76 Project_mim . 420
5.77 Contract_arm . 421
5.78 Contract_mim . 421
5.79 Product_occurrence_arm . 421
5.80 Event_arm . 422
5.81 Time_interval_arm . 423
5.82 Constructive_solid_geometry_3d_arm . 423
5.83 Class_arm . 423
5.84 Class_of_activity_arm . 424
5.85 Class_of_activity_mim . 424
5.86 Property_condition_arm . 424
5.87 Property_condition_mim . 424
5.88 Class_of_product_arm . 424
5.89 Class_of_product_mim . 425
5.90 Property_space_arm . 425
5.91 Property_space_mim . 425
5.92 Property_identification_arm . 426
5.93 Maths_space_arm . 427
5.94 Independent_property_definition_arm . 427
vii
5.95 Independent_property_definition_mim . 428
5.96 Product_class_arm . 428
5.97 Product_class_mim . 430
5.98 Specified_product_arm . 431
5.99 Specified_product_mim . 432
5.100 Multi_linguism_arm . 432
5.101 Multi_linguism_mim . 432
5.102 Extended_measure_representation_arm . 433
5.103 Extended_measure_representation_mim . 434
5.104 Specification_based_configuration_arm . 434
5.105 Specification_based_configuration_mim . 434
5.106 Alternative_solution_arm . 434
5.107 Surface_conditions_arm . 435
5.108 Surface_conditions_mim . 437
5.109 Classification_with_attributes_arm . 438
5.110 Classification_with_attributes_mim . 439
5.111 Specification_control_arm . 439
5.112 Specification_control_mim . 440
5.113 Group_arm . 441
5.114 Group_mim . 441
5.115 Classification_assignment_arm . 441
5.116 Classification_assignment_mim . 441
5.117 Part_collection_arm . 442
5.118 Measure_representation_arm . 442
5.119 Document_and_version_identification_arm . 443
5.120 Document_assignment_arm . 443
5.121 Document_assignment_mim.
...