BS EN ISO 5459:2011

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Role of datums
6 General concepts
7 Graphical language
Annex A (normative) - Association for datums
Annex B (informative) - Invariance classes
Annex C (informative) - Examples
Annex D (informative) - Former practices
Annex E (informative) - Examples of a datum system or a
        common datum established with contacting features
Annex F (normative) - Relations and dimensions of graphical
        symbols
Annex G (informative) - Relationship to the GPS matrix model
Bibliography

Describes terminology, rules and methodology for the indication and understanding of datums and datum systems in technical product documentation.

This International Standard specifies terminology, rules and methodology for the indication and understanding of datums and datum systems in technical product documentation. This International Standard also provides explanations to assist the user in understanding the concepts involved.

This International Standard defines the specification operator (see ISO17450-2) used to establish a datum or datum system. The verification operator (see ISO17450-2) can take different forms (physically or mathematically) and is not the subject of this International Standard.

NOTE The detailed rules for maximum and least material requirements for datums are given in ISO2692.