ISO 10303-108-2005 cor2-2014 PDF

Full title and description

ISO 10303-108:2005/Cor 2:2014 — 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 2. This one-page corrigendum (Cor 2) corrects and clarifies parts of the original ISO 10303-108:2005 publication, which defines STEP integrated application resources for parameterization and constraints used to capture and exchange design intent in explicit geometric product models.

Abstract

ISO 10303-108:2005 defines resource constructs to represent model parameters and constraints (including dimensional values, mathematical relationships between variables, geometric constraints such as parallelism and tangency, and specialised 2D sketch representations) and the mechanisms to associate those constructs with geometric elements so that design intent can be preserved during model exchange. Technical Corrigendum 2 (2014) issues corrections to the 2005 text/schema to improve clarity and data integrity.

General information

• Status: Published (base standard ISO 10303-108:2005 with Technical Corrigendum 2 published as ISO 10303-108:2005/Cor 2:2014).
• Publication date: Base standard: 2005-02 (ISO 10303-108:2005). Corrigendum 2 publication: 2014 (Cor 2: 2014-07 / published 2014).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.040.40 — Industrial process measurement and control / product data representation and exchange.
• Edition / version: Edition 1 (2005) of Part 108, with Technical Corrigendum 2 issued in 2014 (ISO 10303-108:2005/Cor 2:2014).
• Number of pages: Base standard: 154 pages. Corrigendum 2: 1 page.

Scope

ISO 10303-108:2005 covers the representation and exchange of parameterization and constraints for two- and three-dimensional explicit geometric product models. It includes parameterization mechanisms, constraint definitions (mathematical and descriptive), specialized geometric constraints used in shape modelling, sketch/profile representations, and representations for models that are incompletely defined (variational models). The corrigendum provides technical corrections to improve schema clarity and attribute qualifications. Procedural/history-based representations, constraint solution methods, and detailed behaviour of receiving systems when editing transferred variational models are outside the scope of this part.

Key topics and requirements

• Parameterization of models: binding variables to geometric quantities and dimensional values so design intent can be transferred and re-used.
• Constraint representation: mathematical relationships between parameters and descriptive/geometric constraints (e.g., parallelism, tangency).
• Specialized 2D sketch/profile constructs for shape modelling and transfer.
• Associations between constraints/parameters and geometric elements to preserve editability in receiving systems.
• EXPRESS schema and semantic clarifications (corrigenda address ambiguities and attribute qualifications).

Typical use and users

Used by CAD/CAE/PDM/PLM software vendors, implementers of STEP translators, systems integrators, standards engineers, and researchers who need to exchange parametric/constraint-rich CAD models while preserving design intent across heterogeneous systems. Also used by organisations working on long-term archiving of parametric models and by teams implementing AP/SMRL-based interoperability solutions.

Related standards

ISO 10303-108 is part of the STEP (ISO 10303) family and is commonly considered alongside other STEP integrated resources and application parts that address procedural modelling and model-based exchange of CAD data — notably ISO 10303-55 (procedural/construction history concepts), ISO 10303-111 (elements for procedural modelling of solid shapes), ISO 10303-112 (procedural 2D modelling), and higher-level APs such as AP242 for managed model-based 3D engineering. Implementers frequently reference these parts together when attempting to transfer design intent and parametric information.

Keywords

STEP, ISO 10303, Part 108, parameterization, constraints, design intent, EXPRESS schema, corrigendum, CAD data exchange, parametric CAD, geometric constraints.

FAQ

Q: What is this standard?

A: ISO 10303-108:2005 is Part 108 of the ISO 10303 (STEP) family and defines integrated application resources for parameterization and constraints for explicit geometric product models; Cor 2 (2014) is a technical corrigendum that issues corrections to the 2005 text/schema.

Q: What does it cover?

A: It covers how to represent parameters and constraints (both mathematical and geometric/descriptive), how to associate them with geometric elements (2D sketches and 3D shape models), and how to encode incompletely defined (variational) models for exchange. It does not define solution methods for constraint systems or procedural/history-based modelling workflows.

Q: Who typically uses it?

A: CAD/PLM software vendors, STEP implementers and integrators, interoperability test teams, standards bodies, and researchers working on parametric model exchange and long-term archival of CAD data.

Q: Is it current or superseded?

A: The document referenced is a corrigendum (Cor 2, 2014) to the 2005 edition; corrigenda correct the existing edition rather than replace it. The base Part 108:2005 remains the normative edition with Cor 2 applied as a correction. Check ISO or national standards bodies for the latest status or any further revisions.

Q: Is it part of a series?

A: Yes — Part 108 is one resource within the broader ISO 10303 (STEP) family; it is intended to be used alongside other integrated resources and application protocols (e.g., Parts 55, 111, 112 and AP242) when transferring parametric and constraint-rich CAD data.

Q: What are the key keywords?

A: Parameterization, constraints, design intent, STEP, EXPRESS, parametric CAD, geometric constraints, ISO 10303-108, corrigendum.