ISO 10303-41:2000

INTERNATIONAL ISO
STANDARD 10303-41
Second edition
2000-11-01
Industrial automation systems and
integration — Product data representation
and exchange —
Part 41:
Integrated generic resource:
Fundamentals of product description and
support
Systèmes d'automatisation industrielle et intégration — Représentation
et échange de données de produits —
Partie 41: Ressources génériques intégrées: Principes de description
et de support de produits
Reference number
©
ISO 2000
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2000 – All rights reserved

Contents Page
1 Scope . 1
1.1 Generic product description resources . 1
1.2 Generic management resources . 2
1.3 Support resources . 2
2 Normative references . 2
3 Terms, definitions, and abbreviations . 3
3.1 Terms defined in ISO 10303-1 . 3
3.2 Terms defined in ISO 8601 . 4
3.3 Other terms and definitions . 4
3.4 Abbreviations . 5
4 Application context . 5
4.1 Introduction . 6
4.2 Fundamental concepts and assumptions . 6
4.3 Application context entity definitions . 6
4.3.1 application_context . 6
4.3.2 application_context_element . 7
4.3.3 application_context_relationship . 8
4.3.4 application_protocol_definition. 9
4.3.5 library_context . 9
4.3.6 product_concept_context . 10
4.3.7 product_context . 10
4.3.8 product_definition_context . 11
5 Product definition . 12
5.1 Introduction . 13
5.2 Fundamental concepts and assumptions . 13
5.3 Product definition type definition: source . 14
5.4 Product definition entity definitions . 14
5.4.1 product . 14
5.4.2 product_category . 15
5.4.3 product_category_relationship . 16
5.4.4 product_definition . 18
5.4.5 product_definition_context_association . 19
5.4.6 product_definition_context_role . 20
5.4.7 product_definition_effectivity . 20
5.4.8 product_definition_formation . 21
5.4.9 product_definition_formation_relationship . 22
5.4.10 product_definition_formation_with_specified_source . 23
5.4.11 product_definition_relationship. 23
5.4.12 product_definition_substitute . 24
5.4.13 product_definition_with_associated_documents . 26
5.4.14 product_related_product_category . 26
5.4.15 product_relationship . 26
5.5 Product definition function definitions . 27
5.5.1 acyclic_product_category_relationship . 27
5.5.2 acyclic_product_definition_formation_relationship . 28
5.5.3 acyclic_product_definition_relationship . 29
5.5.4 acyclic_product_relationship . 30
iii
5.5.5 get_product_definitions . 31
6 Product property definition . 32
6.1 Introduction . 33
6.2 Fundamental concepts and assumptions . 33
6.3 Product property definition type definitions . 33
6.3.1 characterized_definition . 33
6.3.2 characterized_product_definition . 34
6.3.3 derived_property_select . 34
6.3.4 shape_definition . 34
6.4 Product property definition entity definitions . 35
6.4.1 characterized_object . 35
6.4.2 characterized_object_relationship . 35
6.4.3 general_property . 36
6.4.4 general_property_association . 37
6.4.5 general_property_relationship . 38
6.4.6 product_definition_shape . 38
6.4.7 property_definition . 39
6.4.8 shape_aspect . 40
6.4.9 shape_aspect_relationship . 41
6.5 Product property definition function definitions . 43
6.5.1 acyclic_characterized_object_relationship . 43
6.5.2 acyclic_general_property_relationship . 44
6.5.3 acyclic_shape_aspect_relationship . 45
6.5.4 get_shape_aspects . 46
7 Product property representation . 47
7.1 Introduction . 48
7.2 Fundamental concepts and assumptions . 48
7.3 Product property representation type definition: represented_definition . 48
7.4 Product property representation entity definitions . 49
7.4.1 context_dependent_shape_representation . 49
7.4.2 item_identified_representation_usage . 50
7.4.3 property_definition_representation . 51
7.4.4 shape_definition_representation . 52
7.4.5 shape_representation . 52
7.4.6 shape_representation_relationship . 53
7.5 Product property representation function definitions . 53
7.5.1 relatives_of_product_definition . 53
7.5.2 relatives_of_shape_representations . 54
7.5.3 get_property_definition_representations . 55
8 Management resources . 56
8.1 Introduction . 57
8.2 Fundamental concepts and assumptions . 57
8.3 Management resources type definition: attribute_type . 57
8.4 Management resources entity definitions . 58
8.4.1 action_assignment . 58
8.4.2 action_method_assignment . 58
8.4.3 action_method_role . 59
8.4.4 action_request_assignment . 59
8.4.5 approval_assignment . 60
8.4.6 attribute_classification_assignment . 61
8.4.7 attribute_value_assignment . 61
iv
8.4.8 attribute_value_role . 62
8.4.9 certification_assignment . 62
8.4.10 classification_assignment . 63
8.4.11 classification_role . 64
8.4.12 contract_assignment . 64
8.4.13 date_and_time_assignment . 65
8.4.14 date_assignment . 65
8.4.15 document_reference . 66
8.4.16 document_usage_constraint_assignment . 66
8.4.17 document_usage_role . 67
8.4.18 effectivity_assignment . 68
8.4.19 effectivity_context_assignment . 68
8.4.20 effectivity_context_role . 69
8.4.21 event_occurrence_assignment . 69
8.4.22 event_occurrence_context_assignment . 70
8.4.23 external_identification_assignment . 70
8.4.24 external_referent_assignment . 70
8.4.25 group_assignment . 71
8.4.26 identification_assignment . 72
8.4.27 identification_assignment_relationship . 72
8.4.28 identification_role . 73
8.4.29 library_assignment . 74
8.4.30 name_assignment . 74
8.4.31 organization_assignment . 75
8.4.32 organizational_project_assignment . 75
8.4.33 organizational_project_role . 76
8.4.34 person_and_organization_assignment . 76
8.4.35 person_assignment . 76
8.4.36 security_classification_assignment . 77
8.4.37 time_assignment . 78
8.4.38 time_interval_assignment . 78
8.5 Management resources function definition: acyclic_identification_assignment_relationship
........................................................................ 78
9 Document . 80
9.1 Introduction . 80
9.2 Fundamental concepts and assumptions . 80
9.3 Document type definition: product_or_formation_or_definition . 81
9.4 Document entity definitions . 81
9.4.1 document . 81
9.4.2 document_product_association . 82
9.4.3 document_relationship . 83
9.4.4 document_representation_type . 83
9.4.5 document_type . 84
9.4.6 document_usage_constraint . 84
9.4.7 document_with_class . 85
9.5 Document function definition: acyclic_document_relationship . 85
10 Action . 86
10.1 Introduction . 87
10.2 Fundamental concepts and assumptions . 87
10.3 Action type definition: supported_item . 87
10.4 Action entity definitions . 88
10.4.1 action . 88
v
10.4.2 action_directive . 89
10.4.3 action_method . 90
10.4.4 action_method_relationship . 90
10.4.5 action_relationship . 91
10.4.6 action_request_solution . 92
10.4.7 action_request_status . 92
10.4.8 action_resource . 93
10.4.9 action_resource_relationship . 93
10.4.10 action_resource_type . 94
10.4.11 action_status . 94
10.4.12 directed_action . 95
10.4.13 executed_action . 95
10.4.14 versioned_action_request . 96
10.5 Action function definitions . 96
10.5.1 acyclic_action_method_relationship . 96
10.5.2 acyclic_action_relationship . 97
10.5.3 acyclic_action_resource_relationship . 98
11 Certification . 99
11.1 Introduction . 100
11.2 Fundamental concepts and assumptions . 100
11.3 Certification entity definitions . 100
11.3.1 certification . 100
11.3.2 certification_type . 101
12 Approval . 101
12.1 Introduction . 102
12.2 Fundamental concepts and assumptions . 102
12.3 Approval entity definitions . 102
12.3.1 approval . 102
12.3.2 approval_date_time . 103
12.3.3 approval_person_organization . 104
12.3.4 approval_relationship . 104
12.3.5 approval_role . 105
12.3.6 approval_status . 105
12.4 Approval function definition: acyclic_approval_relationship . 106
13 Contract . 107
13.1 Introduction . 107
13.2 Fundamental concepts and assumptions . 108
13.3 Contract entity definitions . 108
13.3.1 contract . 108
13.3.2 contract_relationship . 108
13.3.3 contract_type . 109
13.4 Contract function definition: acyclic_contract_relationship . 109
14 Security classification . 110
14.1 Introduction . 111
14.2 Fundamental concepts and assumptions . 111
14.3 Security classification entity definitions . 111
14.3.1 security_classification . 111
14.3.2 security_classification_level . 112
15 Person organization . 112
vi
15.1 Introduction . 113
15.2 Fundamental concepts and assumptions . 113
15.3 Person organization type definition: person_organization_select . 113
15.4 Person organization entity definitions . 114
15.4.1 address . 114
15.4.2 organization . 115
15.4.3 organization_relationship . 116
15.4.4 organization_role . 116
15.4.5 organizational_address . 117
15.4.6 organizational_project . 118
15.4.7 organizational_project_relationship . 118
15.4.8 person . 119
15.4.9 person_and_organization . 120
15.4.10 person_and_organization_role . 121
15.4.11 person_role . 122
15.4.12 personal_address . 123
15.5 Person organization function definitions . 123
15.5.1 acyclic_organization_relationship . 123
15.5.2 acyclic_organizational_project_relationship . 124
16 Date time . 125
16.1 Introduction . 126
16.2 Fundamental concepts and assumptions . 126
16.3 Date time type definitions . 126
16.3.1 ahead_or_behind . 126
16.3.2 date_time_or_event_occurrence . 126
16.3.3 date_time_select . 127
16.3.4 day_in_month_number . 127
16.3.5 day_in_week_number . 127
16.3.6 day_in_year_number . 127
16.3.7 hour_in_day . 128
16.3.8 minute_in_hour . 128
16.3.9 month_in_year_number . 128
16.3.10 second_in_minute . 129
16.3.11 week_in_year_number . 129
16.3.12 year_number . 130
16.4 Date time entity definitions . 130
16.4.1 calendar_date . 130
16.4.2 coordinated_universal_time_offset . 131
16.4.3 date . 132
16.4.4 date_and_time . 132
16.4.5 date_role . 132
16.4.6 date_time_role . 133
16.4.7 event_occurrence . 134
16.4.8 event_occurrence_context_role . 134
16.4.9 event_occurrence_relationship . 135
16.4.10 event_occurrence_role . 135
16.4.11 local_time. 136
16.4.12 ordinal_date . 137
16.4.13 relative_event_occurrence . 137
16.4.14 time_interval . 137
16.4.15 time_interval_relationship . 138
16.4.16 time_interval_role . 139
16.4.17 time_interval_with_bounds . 139
vii
16.4.18 time_role . 140
16.4.19 week_of_year_and_day_date . 141
16.5 Date time function definitions . 141
16.5.1 acyclic_event_occurrence_relationship . 141
16.5.2 acyclic_time_interval_relationship . 142
16.5.3 leap_year . 143
16.5.4 valid_calendar_date . 143
16.5.5 valid_time . 144
17 Group . 145
17.1 Introduction . 145
17.2 Fundamental concepts and assumptions . 145
17.3 Group entity definitions . 145
17.3.1 group . 145
17.3.2 group_relationship . 146
17.4 Group function definition: acyclic_group_relationship . 147
18 Effectivity . 148
18.1 Introduction . 149
18.2 Fundamental concepts and assumptions . 149
18.3 Effectivity entity definitions . 149
18.3.1 dated_effectivity . 149
18.3.2 effectivity . 150
18.3.3 effectivity_relationship . 151
18.3.4 lot_effectivity . 151
18.3.5 serial_numbered_effectivity . 152
18.3.6 time_interval_based_effectivity . 152
18.4 Effectivity function definition: acyclic_effectivity_relationship . 153
19 External reference . 154
19.1 Introduction . 154
19.2 Fundamental concepts and assumptions . 154
19.3 External reference type definitions . 155
19.3.1 message . 155
19.3.2 source_item . 155
19.4 External reference entity definitions . 155
19.4.1 external_source . 155
19.4.2 external_source_relationship . 156
19.4.3 externally_defined_item . 157
19.4.4 externally_defined_item_relationship . 157
19.4.5 pre_defined_item . 158
19.5 External reference function definitions . 158
19.5.1 acyclic_external_source_relationship . 158
19.5.2 acyclic_externally_defined_item_relationship . 159
20 Support resource . 160
20.1 Introduction . 161
20.2 Fundamental concepts and assumptions . 161
20.3 Support resource type definitions . 161
20.3.1 identifier . 161
20.3.2 label . 161
20.3.3 text . 162
20.4 Support resource function definitions . 162
20.4.1 bag_to_set . 162
viii
20.4.2 type_check_function . 162
21 Measure . 164
21.1 Introduction . 164
21.2 Fundamental concepts and assumptions . 164
21.3 Measure type definitions . 165
21.3.1 amount_of_substance_measure . 165
21.3.2 area_measure . 165
21.3.3 celsius_temperature_measure . 165
21.3.4 context_dependent_measure . 165
21.3.5 count_measure . 165
21.3.6 descriptive_measure . 166
21.3.7 electric_current_measure . 166
21.3.8 length_measure . 166
21.3.9 luminous_intensity_measure . 166
21.3.10 mass_measure . 166
21.3.11 measure_value . 167
21.3.12 numeric_measure . 167
21.3.13 parameter_value . 167
21.3.14 plane_angle_measure . 168
21.3.15 positive_length_measure . 168
21.3.16 positive_plane_angle_measure . 168
21.3.17 positive_ratio_measure . 168
21.3.18 ratio_measure . 169
21.3.19 si_prefix . 169
21.3.20 si_unit_name . 170
21.3.21 solid_angle_measure . 172
21.3.22 thermodynamic_temperature_measure . 172
21.3.23 time_measure . 172
21.3.24 unit . 172
21.3.25 volume_measure . 173
21.4 Measure entity definitions . 173
21.4.1 amount_of_substance_measure_with_unit . 173
21.4.2 amount_of_substance_unit . 173
21.4.3 area_measure_with_unit . 174
21.4.4 area_unit . 174
21.4.5 celsius_temperature_measure_with_unit . 175
21.4.6 context_dependent_unit . 175
21.4.7 conversion_based_unit . 175
21.4.8 derived_unit . 176
21.4.9 derived_unit_element . 177
21.4.10 dimensional_exponents . 177
21.4.11 electric_current_measure_with_unit . 178
21.4.12 electric_current_unit . 178
21.4.13 global_unit_assigned_context . 179
21.4.14 length_measure_with_unit . 179
21.4.15 length_unit . 179
21.4.16 luminous_intensity_measure_with_unit . 180
21.4.17 luminous_intensity_unit . 180
21.4.18 mass_measure_with_unit . 181
21.4.19 mass_unit . 181
21.4.20 measure_with_unit . 182
21.4.21 named_unit . 182
21.4.22 plane_angle_measure_with_unit . 183
ix
21.4.23 plane_angle_unit . 183
21.4.24 ratio_measure_with_unit . 184
21.4.25 ratio_unit . 184
21.4.26 si_unit . 184
21.4.27 solid_angle_measure_with_unit . 185
21.4.28 solid_angle_unit . 185
21.4.29 thermodynamic_temperature_measure_with_unit . 186
21.4.30 thermodynamic_temperature_unit . 186
21.4.31 time_measure_with_unit . 186
21.4.32 time_unit . 187
21.4.33 volume_measure_with_unit . 187
21.4.34 volume_unit . 188
21.5 Measure function definitions . 188
21.5.1 derive_dimensional_exponents . 188
21.5.2 dimensions_for_si_unit . 189
21.5.3 valid_units . 190
22 Basic attribute . 192
22.1 Introduction . 194
22.2 Fundamental concepts and assumptions . 195
22.3 Basic attribute type definitions . 195
22.3.1 description_attribute_select . 195
22.3.2 id_attribute_select . 196
22.3.3 name_attribute_select . 196
22.3.4 role_select . 196
22.4 Basic attribute entity definitions . 197
22.4.1 description_attribute . 197
22.4.2 id_attribute . 197
22.4.3 name_attribute . 198
22.4.4 object_role . 198
22.4.5 role_association . 199
22.5 Basic attribute function definitions . 199
22.5.1 get_description_value . 199
22.5.2 get_id_value . 200
22.5.3 get_name_value . 200
22.5.4 get_role . 201
Annex A (normative) Short names of entities . 202
Annex B (normative) Information object registration . 208
B.1 Document identification . 208
B.2 Schema identification . 208
B.2.1 application_context_schema identification . 208
B.2.2 product_definition_schema identification . 208
B.2.3 product_property_definition_schema identification . 208
B.2.4 product_property_representation_schema identification . 209
B.2.5 management_resources_schema identification . 209
B.2.6 document_schema identification . 209
B.2.7 action_schema identification . 209
B.2.8 certification_schema identification . 209
B.2.9 approval_schema identification . 210
B.2.10 contract_schema identification . 210
B.2.11 security_classification_schema identification . 210
B.2.12 person_organization_schema identification . 210
x
B.2.13 date_time_schema identification . 210
B.2.14 group_schema identification . 211
B.2.15 effectivity_schema identification. 211
B.2.16 external_reference_schema identification . 211
B.2.17 support_resource_schema identification . 211
B.2.18 measure_schema identification . 211
B.2.19 basic_attribute_schema identification . 212
Annex C (informative) Computer-interpretable listing . 213
Annex D (informative) EXPRESS-G diagrams . 214
Annex E (informative) Technical discussions . 259
E.1 Generic product description resource structure . 259
E.2 Function template for cycle detection: acyclic_object_relationship . 259
E.3 Relationship template: object_relationship . 260
E.4 Constraining entity instances of the basic_attribute_schema . 261
Annex F (informative) Examples . 262
F.1 Use of the product_definition_schema . 262
F.2 Document as product . 263
F.2.1 Identification of a document . 263
F.2.2 Identification of a version of a document . 263
F.2.3 Identification of a definition of document . 264
F.2.4 Assembly structure of a document . 264
F.2.5 Association of documentation to other data . 264
F.2.6 Enabling use of document specific resources . 264
F.2.7 Properties of a document . 265
F.3 Use of the generic management resource constructs . 265
F.4 Use of the measure_schema . 266
F.4.1 Derived SI units . 266
F.4.2 Currency conversion . 268
F.4.3 Context dependent unit . 269
F.4.4 Unit conversion based on an algebraic expression . 269
F.4.5 Derivation of area unit and volume unit . 270
F.4.6 Use of global_unit_assigned_context . 271
F.5 Use of the person_organization_schema . 271
F.5.1 Address of a person in an organization . 271
F.5.2 Use of person_assignment . 272
Bibliography . 273
Index . 274
Figures
Figure 1 - The relationship of the schemas of this part to the ISO10303 integration architecture . . xvi
Figure D.1 - EXPRESS-G diagram of the application_context_schema (1 of 1) . 215
Figure D.2 - EXPRESS-G diagram of the product_definition_schema (1 of 2) . 216
Figure D.3 - EXPRESS-G diagram of the product_definition_schema (2 of 2) . 217
Figure D.4 - EXPRESS-G diagram of the product_property_definition_schema (1 of 3) . 218
Figure D.5 - EXPRESS-G diagram of the product_property_definition_schema (2 of 3) . 219
Figure D.6 - EXPRESS-G diagram of the product_property_definition_schema (3 of 3) . 220
xi
Figure D.7 - EXPRESS-G diagram of the product_property_representation_schema (1 of 2) . 221
Figure D.8 - EXPRESS-G diagram of the product_property_representation_schema (2 of 2) . 222
Figure D.9 - EXPRESS-G diagram of the management_resources_schema (1 of 8) . 223
Figure D.10 - EXPRESS-G diagram of the management_resources_schema (2 of 8) . 224
Figure D.11 - EXPRESS-G diagram of the management_resources_schema (3 of 8) . 225
Figure D.12 - EXPRESS-G diagram of the management_resources_schema (4 of 8) . 226
Figure D.13 - EXPRESS-G diagram of the management_resources_schema (5 of 8) . 227
Figure D.14 - EXPRESS-G diagram of the management_resources_schema (6 of 8) . 228
Figure D.15 - EXPRESS-G diagram of the management_resources_schema (7 of 8) . 229
Figure D.16 - EXPRESS-G diagram of the management_resources_schema (8 of 8) . 230
Figure D.17 - EXPRESS-G diagram of the document_schema (1 of 1) . 231
Figure D.18 - EXPRESS-G diagram of the action_schema (1 of 2) . 232
Figure D.19 - EXPRESS-G diagram of the action_schema (2 of 2) . 233
Figure D.20 - EXPRESS-G diagram of the certification_schema (1 of 1) . 234
Figure D.21 - EXPRESS-G diagram of the approval_schema (1 of 1) . 235
Figure D.22 - EXPRESS-G diagram of the contract_schema (1 of 1) . 236
Figure D.23 - EXPRESS-G diagram of the security_classification_schema (1 of 1) . 237
Figure D.24 - EXPRESS-G diagram of the person_organization_schema (1 of 3) . 238
Figure D.25 - EXPRESS-G diagram of the person_organization_schema (2 of 3) . 239
Figure D.26 - EXPRESS-G diagram of the person_organization_schema (3 of 3) . 240
Figure D.27 - EXPRESS-G diagram of the date_time_schema (1 of 3) . 241
Figure D.28 - EXPRESS-G diagram of the date_time_schema (2 of 3) . 242
Figure D.29 - EXPRESS-G diagram of the date_time_schema (3 of 3) . 243
Figure D.30 - EXPRESS-G diagram of the group_schema (1 of 1) . 244
Figure D.31 - EXPRESS-G diagram of the effectivity_schema (1 of 1) . 245
Figure D.32 - EXPRESS-G diagram of the external_reference_schema (1 of 1) . 246
Figure D.33 - EXPRESS-G diagram of the support_resource_schema (1 of 1) . 247
Figure D.34 - EXPRESS-G diagram of the measure_schema (1 of 6) . 248
Figure D.35 - EXPRESS-G diagram of the measure_schema (2 of 6) . 249
Figure D.36 - EXPRESS-G diagram of the measure_schema (3 of 6) . 250
Figure D.37 - EXPRESS-G diagram of the measure_schema (4 of 6) . 251
Figure D.38 - EXPRESS-G diagram of the measure_schema (5 of 6) . 252
Figure D.39 - EXPRESS-G diagram of the measure_schema (6 of 6) . 253
Figure D.40 - EXPRESS-G diagram of the basic_attribute_schema (1 of 5) . 254
Figure D.41 - EXPRESS-G diagram of the basic_attribute_schema (2 of 5) . 255
Figure D.42 - EXPRESS-G diagram of the basic_attribute_schema (3 of 5) . 256
Figure D.43 - EXPRESS-G diagram of the basic_attribute_schema (4 of 5) . 257
Figure D.44 - EXPRESS-G diagram of the basic_attribute_schema (5 of 5) . 258
Tables
Table A.1 - Short names of entities . 202
xii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies
for voting. Publication as an International Standard requires approval by at least 75 % of the member
bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 10303 may be the
subject of patent rights. ISO shall not be held responsible for identifying any or all such patent
...