ISO 10303-108-2005 cor1-2008 PDF

Full title and description

ISO 10303-108:2005/Cor 1:2008 — Industrial automation systems and integration — Product data representation and exchange — Part 108: Integrated application resource: Parameterization and constraints for explicit geometric product models — Technical Corrigendum 1. This corrigendum corrects and clarifies elements of the original ISO 10303-108:2005 resource to improve the specification of parameter and constraint constructs used when exchanging parametric geometric product models (STEP AP108-related resource corrections).

Abstract

ISO 10303-108:2005 defines resource constructs for representing model parameters and geometric constraints so that parametric design intent can be exchanged between CAD and other modeling systems. The corrigendum (Cor 1:2008) issues technical corrections to the 2005 text without changing the overall scope: it preserves the mechanisms for associating parameters and constraints with geometric elements while excluding procedural/history-based representations, solver algorithms, and form-feature prescriptions. The goal is to enable receiving systems to reconstruct behavioural aspects of models where appropriate following data exchange.

General information

• Status: Published (Technical Corrigendum to ISO 10303-108:2005).
• Publication date: December 2008 (Corrigendum published 2008‑12 — Corr. 1 to the 2005 edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.040.40 (Industrial process measurement and control / STEP-related product data exchange).
• Edition / version: Corrigendum 1 (applies to ISO 10303-108, Edition 1 — 2005); Corrigendum edition 1 (2008).
• Number of pages: 38 (corrigendum document length).

Scope

This corrigendum applies to ISO 10303-108:2005 and addresses technical corrections to the resource that specifies parameterization and constraint constructs for explicit geometric product models. The overall scope of Part 108 (2005) is to provide resource-level definitions and association mechanisms for model parameters and constraints intended for use in STEP-based data exchange; it does not define procedural construction history, numerical solver algorithms, or feature-level behavioural semantics beyond what is needed to transfer constraint relationships. The corrigendum corrects and clarifies the published resource text to improve interoperability and implementability during data exchange.

Key topics and requirements

• Resource constructs for representing model parameters (parameter entities, value descriptions, parameter sets).
• Representation of geometric constraints and constraint relationships between model elements.
• Mechanisms for associating parameters and constraints with geometric or other model elements in a transferred model.
• Definitions and clarifications (via corrigendum) to improve unambiguous interpretation by implementers.
• Explicit exclusions: procedural/history-based model representations, implicit/procedural constraints, solver methods, form-feature semantics, and accuracy/constraint‑solution prescriptions.

Typical use and users

Implementers of STEP/AP-based translators and data exchange tools, CAD/PDM/PLM vendors, systems integrators, and organizations that need to preserve parametric design intent when exchanging models between heterogeneous CAD systems. Researchers and tool developers working on parametric model interoperability also use Part 108 and its corrigenda to guide implementation choices and mapping strategies for constraints and parameters. Practical use cases include parametric model exchange, legacy model migration, and multi‑CAD collaborative design workflows.

Related standards

ISO 10303-108 is part of the ISO 10303 (STEP) family. Closely related parts and application protocols include ISO 10303-55 (procedural/history representations), ISO 10303-111 (additional product model resources), and higher-level APs that consume resource parts (APs for shape and product structure such as AP203/AP214/AP242). Corrigenda and later resource updates (e.g., subsequent corrigenda or resource revisions) are also relevant to implementers.

Keywords

ISO 10303, STEP, AP108, parameterization, constraints, parametric CAD, geometric product models, corrigendum, data exchange, PLM interoperability.

FAQ

Q: What is this standard?

A: ISO 10303-108:2005/Cor 1:2008 is a technical corrigendum to ISO 10303-108:2005 (Part 108 of the STEP suite) that issues corrections and clarifications to the resource describing parameterization and constraint constructs for explicit geometric product models.

Q: What does it cover?

A: It covers corrections to the resource-level definitions and association mechanisms for parameters and constraints used when exchanging parametric geometric models. The underlying Part 108 (2005) specifies how parameters and constraints are represented and linked to geometric elements for transfer between systems; the corrigendum corrects the published wording and technical details without changing the intended scope.

Q: Who typically uses it?

A: CAD/PLM software developers, STEP implementers and integrators, systems engineers, and organizations exchanging parametric CAD data who need consistent, implementable definitions for parameters and constraints.

Q: Is it current or superseded?

A: The document is a corrigendum published in December 2008 that applies to the 2005 edition of ISO 10303-108. Users should check the ISO/TC 184/SC 4 catalogue or national standards bodies for any later corrigenda or revisions (for example, subsequent corrigenda or updated resource parts) to ensure they are using the most recent, applicable texts for implementation.

Q: Is it part of a series?

A: Yes. It is Part 108 of the ISO 10303 suite (STEP). Part 108 is one resource among many in the STEP modular structure; it is intended to be used together with relevant application protocols and other resource parts (such as Parts 55 and 111) for complete parametric model exchange solutions.

Q: What are the key keywords?

A: STEP, AP108, parameterization, constraints, parametric CAD, geometric product model, corrigendum, data exchange, interoperability.