©ISO ISO 10303-1:1994(E)
3.2.29 product information model: an information model which provides an abstract description of facts, concepts and instructions about a product.
3.2.30 protocol implementation conformance statement (PICS): a statement of which capabilities and options are supported within an implementation of a given standard. This statement is produced by completing a PICS proforma.
3.2.31 resource construct: a collection of EXPRESS language entities, types, functions, rules and references that together define a valid description of an aspect of product data.
3.2.32 structure: a set of interrelated parts of any complex thing, and the relationships between them.
3.2.33 unit of functionality: a collection of application objects and their relationships that defines one or more concepts within the application context such that removal of any component would render the concepts incomplete or ambiguous.
3.3 Abbreviations
For the purposes of this part of ISO 10303, the following symbols and abbreviations apply. AAM application activity model.
AIM application interpreted model. AP application protocol. ARM application reference model. PICS protocol implementation conformance statement.
4 Overview of ISO 10303 4.1 Purpose
The purpose of ISO 10303 is to specify a form for the unambiguous representation and exchange of computer-interpretable product data throughout the life of a product. This form is independent of any particular computer system. This form enables consistent implementations across multiple applications and systems. This International Standard permits different implementation methods to be used for storing, accessing, transferring, and archiving product data. Implementations can be tested for conformance.
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ISO 10303-1:1994(E) ©iso
4.2 Fundamental principles
ISO 10303 separates the techniques of representation of product information from the implementation methods used for data exchange.
The representation techniques provide a single representation of product information common to many applications. This common representation can be tailored to meet the needs of specific applications. An application protocol specifies the representation of product information for one or more applications.
ISO 10303 specifies the implementation methods that support the exchange of product data defined in application protocols.
ISO 10303 defines a formal data specification language, EXPRESS which is used to specify the representation of product information. The use of a formal language provides unambiguous and consistent representation and facilitates development of implementations.
ISO 10303 provides a methodology and framework for conformance testing of implementations.
4.2.1 Integrated resources
The specification of a representation of product information is provided by a set of integrated resources. Each integrated resource comprises a set of product data descriptions, written in EXPRESS known as resource constructs. One set may be dependent on other sets for its definition. Similar information for different applications is represented by a single resource construct.
The integrated resources are divided into two groups: generic resources and application resources. The generic resources are independent of applications and can reference each other. The application resources can reference the generic resources and can add other resource constructs for use by a group of similar applications. Application resources do not reference other application resources.
4.2.2 Support for applications
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