ISO 10303-108-2005 PDF

Full title and description

ISO 10303-108:2005 — Industrial automation systems and integration — Product data representation and exchange — Part 108: Integrated application resource: Parameterization and constraints for explicit geometric product models. This part of the STEP (ISO 10303) family defines resource constructs to represent model parameters and constraints and the mechanisms to associate them with geometric or other elements of transferred models, enabling transfer of behavioural/intention information alongside geometry.

Abstract

Specifies resource constructs for representing parameters and constraints in CAD or other models and the mechanisms for associating those constructs with geometric or other elements of exchanged models so that receiving systems can reconstruct corresponding behavioural characteristics and enable editability. Excludes procedural/history-based representations, solution methods for constraint equations, form-feature representations, and detailed accuracy/behaviour presentation requirements.

General information

• Status: Published (International Standard, confirmed).
• Publication date: February 2005 (Edition 1, 2005-02).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.040.40.
• Edition / version: Edition 1 (2005).
• Number of pages: 154.

Corrigenda: Technical Corrigendum 1 published December 2008 and Technical Corrigendum 2 published July 2014 (apply to ISO 10303-108:2005).

Scope

Defines the integrated application resource for parameterization and constraints for explicit geometric product models exchanged using STEP (ISO 10303). The standard covers constructs to describe model parameters and constraint relationships and how these are linked to transferred geometric or other model elements in order to convey aspects of model behaviour and edit intent. It explicitly excludes procedural or history-based model representations, implicit/procedural constraints from construction sequences, numerical solution methods for constraint systems, form-feature representations, and detailed accuracy or post-transfer behaviour presentation.

Key topics and requirements

• Resource constructs for parameter definition and parameter instances.
• Representation of explicit geometric constraints and constraint relationships.
• Mechanisms to associate parameters and constraints with geometric or non-geometric model elements (linking and referencing).
• Support to transfer sufficient information to allow receiving systems to reconstruct behavioural characteristics (design intent) where feasible.
• Clear exclusions: no procedural/history-based representations, no solver algorithms, no form-feature semantics or guaranteed accuracy specifications.

Typical use and users

Used by CAD/PLM software vendors, system integrators, interoperability engineers, and organizations exchanging parametric or variational geometric data between authoring and receiving systems. Also referenced by researchers and interoperability testbeds working on STEP-based parametric model exchange. Implementations commonly appear in CAD translators, PLM import/export modules, and tools that attempt to preserve design intent during data exchange.

Related standards

Part of the ISO 10303 (STEP) family of standards for product data representation and exchange. Related parts include overview/fundamental principles and many application protocols (APs) such as AP203 and AP214 for 3D CAD data exchange, and ISO 10303-55 (procedural/history representations) which is explicitly noted as covering procedural representations excluded from Part 108. Implementers typically consider multiple APs and resources from the STEP suite when planning full data-exchange capability.

Keywords

ISO 10303, STEP, parameterization, constraints, parametric CAD, geometric constraints, design intent, application resource, product data exchange, AP108.

FAQ

Q: What is this standard?

A: ISO 10303-108:2005 is a STEP integrated application resource that defines how to represent model parameters and explicit geometric constraints and how to associate them with elements of exchanged models so receiving systems can reconstruct behavioural characteristics.

Q: What does it cover?

A: It covers data constructs for parameter instances, constraint relationships, and linking mechanisms to geometry or other model elements. It does not cover procedural/history-based modeling, solver algorithms, form-feature semantics, or detailed accuracy/behaviour presentation.

Q: Who typically uses it?

A: CAD and PLM vendors, integration engineers, and organizations exchanging parametric CAD models; also researchers and testbed projects working on STEP-based model interoperability.

Q: Is it current or superseded?

A: The document ISO 10303-108:2005 is the published Edition 1 (February 2005) and has been maintained with published corrigenda (2008 and 2014). It remains a part of the STEP resource set; users should check national/ISO catalogues for the most recent review/supersession status before procurement.

Q: Is it part of a series?

A: Yes — it is a resource (Part 108) within the broader ISO 10303 (STEP) series of parts, which includes many application protocols (APs) and resources used together to represent and exchange complete product data.

Q: What are the key keywords?

A: parameterization, constraints, parametric CAD, STEP, ISO 10303, design intent, application resource, AP108.