Foreword

ISO/PDTS 10303-1077 was prepared by Technical Committee ISO/TC 184, Industrial automation systems and integration, Subcommittee SC4, Industrial data.

This International Standard is organized as a series of parts, each published separately. The parts of ISO 10303 fall into one of the following series: description methods, integrated resources, application inter-preted constructs, application modules, application protocols, abstract test suites, implementation methods, and conformance testing. The series are described in ISO 10303-1. A complete list of parts of ISO 10303 is available from the Internet:

http://www.nist.gov/sc4/editing/step/titles/.

Annexes A and B form an integral part of this part of ISO 10303. Annexes, C, D, E, aand F are for information only.

Introduction

For engineering analysis, it is necessary to distinguish between:

• an individual product;
• a specification for a product, which can be a requirement or a design;
• an explicit set of individual products; and
• a usage of one product specification within another.

An individual product can be directly observed or measured while it exists. The result of an observation or measurement that has been carried out can be recorded as a possession of a property by the individual product.

EXAMPLE - The individual product that is 'widget serial number 98/1234' has a mass of 10 Kg. This is a fact about the individual product that is known as a result of measurement.

A product design can be associated with a property value to indicate that each individual product to the design possesses the property value. The association between a product design and a property value can be either:

• a criterion for compliance with the design; or
• a predicted consequence of compliance with the design.

In may cases, the criteria for compliance with a design are deemed by a designer, and the consequences for compliance with a design are predicted by an analyst using finite element analysis or some other analytical method.

EXAMPLE - The product design that is 'widget type XYZ_123' has a wall thickness between 10 and 11 mm as a design criterion. Any widget that does not have a wall thickness within this range does not comply with the design.

The product design that is 'widget type XYZ_123' has a mass between 7 and 8 Kg. Any widget that is to the design is predicted to have a mass within this range.

Product requirements can be associated with a property value to indicate that each individual product that meets the requirements possessed the property value. The association between product requirements and a property value can be either:

• a criterion for satisfaction of the requirements; or
• a predicted consequence of satisfaction of the requirements.

This module treats a product design and product requirements in the same way, and both are referred to as 'product specification'. A product specification is a class because is has individual products as members. These are individual product that comply with the design or that satisfy the requirements.

Industrial automation systems and integration —
Product data representation and exchange —
Part 1077: Application module: Product specification or set

1 Scope

This application module records the existence of a product specification or an explicit set of individual products. The following are within the scope of this application module:

• the existence of a product specification, which can be a product design or product requirements, or a set of individual products;

  EXAMPLE - 'Part type XYZ_123' is a product design. A property possessed by 'part type XYZ_123' can be a criterion for compliance with the design or a predicted consequence of compliance with the design.

  EXAMPLE - 'Required fastener for joint type ABC' is a product requirement. A property possessed by 'required fastener for joint type ABC' can be a criterion for meeting the requirement or a predicted consequence of meeting with the requirement.

• the occurrence of one product design within another.

  EXAMPLE - 'Fastener 27 in joint type ABC' is an occurrence of the product specifications 'fastener type F_345'. An individual fastener in position 27 of a individual joint of design 'joint type ABC' is a member of:

  • the design occurrence that is 'fastener 27 in joint type ABC'; and

  • the product design that is 'fastener type F_345'.

  Hence the individual fastener in position 27 complies with the positioning criterion for being in position 27, and with the property criteria for being of type F_345.

The following are not within the scope of this application module:

• an individual product;
• the properties of an individual product or product specification;

  NOTE - A property of a product specification or set is defined in the possession of property module. A property distribution over positions within a product specification or set is defined in the property distribution module.

• assembly or connectivity relationships between individual products or product specifications;
• version control or configuration management information for a product specification.