ISO 10303-44-2014 PDF

Full title and description

ISO 10303-44:2014 — Industrial automation systems and integration — Product data representation and exchange — Part 44: Product structure using explicit representation. This part of the ISO 10303 (STEP) family defines data definitions and structures for representing explicit product structure, assemblies, parts and their relationships to support consistent exchange of product-structure information between computer-aided design, manufacturing and product lifecycle systems.

Abstract

ISO 10303-44:2014 specifies an EXPRESS-based model and related information constructs for explicit representation of product structure. It standardizes entities and relationships needed to describe assemblies, subassemblies, component occurrences, quantities, structure hierarchy, references to product definitions and configuration control information used when exchanging product-structure data between heterogeneous systems. The part supports accurate Bills of Materials (BOM), assembly trees and other product-structure views required for engineering and manufacturing processes.

General information

• Status: International Standard (published).
• Publication date: 2014.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: ICS 35.240 (Information technology — product data / data exchange standards) — STEP family of standards.
• Edition / version: ISO 10303-44:2014 (1st edition, 2014).
• Number of pages: Approximately 40–60 pages (varies by published print/pdf package).

Scope

This part of ISO 10303 defines an application-neutral schema for representing explicit product structure information to enable exchange and sharing across CAD, PDM, PLM and manufacturing systems. It focuses on the structural aspects of products (instances, occurrences, assemblies, components, quantities, and inter-part relationships) rather than geometric shape representation. The standard is intended to be used with other STEP parts (for shape, materials, tolerances, configuration) to provide a complete product-definition exchange.

Key topics and requirements

• EXPRESS schema defining entities for assemblies, component occurrences and hierarchical product structure.
• Definitions for occurrences, instances, part relationships and assembly relationships supporting multi-level BOMs.
• Attributes for quantities, units and measures associated with structural elements.
• References and linking to product definition resources (e.g., shape, tolerances, documents) managed in other STEP parts.
• Requirements for unambiguous identification of parts and occurrences to support configuration management and change control.
• Guidance for mapping the schema to STEP exchange mechanisms (e.g., STEP physical file constructs) for data interchange.

Typical use and users

Primary users are implementers and integrators of CAD, PDM and PLM systems, software vendors providing STEP import/export capabilities, manufacturing planners, configuration managers and systems engineers who need reliable exchange of product-structure data between heterogeneous systems. Typical uses include transferring BOMs and assembly trees between CAD systems, synchronizing PDM/PLM repositories, supplier data exchange and consolidating multi-CAD product definitions for downstream manufacturing and service processes.

Related standards

ISO 10303-44 is part of the wider ISO 10303 (STEP) family. Commonly referenced related parts and standards include ISO 10303-1 (overview and fundamental principles), ISO 10303-11 (EXPRESS language), ISO 10303-21 (STEP physical file — clear text encoding), application protocols such as AP203, AP214 and AP242 (product and automotive data models), and other AP parts covering geometry, materials and product definition. Implementations often combine Part 44 structure models with APs that provide shape, manufacturing and tolerance data.

Keywords

ISO 10303, STEP, product structure, BOM, assembly, EXPRESS, PLM, PDM, CAD data exchange, configuration, product data representation.

FAQ

Q: What is this standard?

A: ISO 10303-44:2014 is a part of the STEP family that defines an EXPRESS-based model for explicit representation of product structure (assemblies, components and their relationships) to support interoperable exchange of structural product data.

Q: What does it cover?

A: It covers data constructs and requirements for representing product hierarchies, component occurrences, quantities, and inter-part relationships, and how those structural definitions link to other product definition information for data exchange purposes.

Q: Who typically uses it?

A: CAD/PDM/PLM software vendors, systems integrators, engineering and manufacturing organizations, and any stakeholders who need to exchange or consolidate product-structure information between different systems.

Q: Is it current or superseded?

A: The document specified is the 2014 edition. Users should verify whether a newer revision or an alternative STEP application protocol (for example AP242 which consolidates several APs) better meets their needs; standards and related APs evolve, so check the latest ISO catalog or your national standards body for updates before implementing.

Q: Is it part of a series?

A: Yes — it is part of the ISO 10303 (STEP) series. Many implementations combine Part 44 with other STEP parts (e.g., APs for geometry, AP242 for managed model-based definitions and product data) to cover the full set of product-definition requirements.

Q: What are the key keywords?

A: STEP, ISO 10303, product structure, assembly, BOM, EXPRESS, PLM, data exchange, configuration management.