ISO 10303-225-1999 PDF

Full title and description

Industrial automation systems and integration — Product data representation and exchange — Part 225: Application protocol: Building elements using explicit shape representation. This ISO application protocol (AP 225) defines the information constructs and integrated resources needed to exchange geometric shape, property and spatial-configuration information for building elements using explicit solid-shape representations (B-rep, CSG, swept solids, etc.).

Abstract

This part of ISO 10303 specifies the integrated resources and information requirements for exchanging building-element shape, property and spatial configuration information between application systems using explicit shape representations. It supports activities across the building lifecycle (design, construction, maintenance), including concurrent design, design integration and visualization, specification for construction/maintenance, analysis and review. The standard notes that it addresses the shape/property/spatial-configuration portion of building information and can be used for as‑built records, approvals and change tracking.

General information

• Status: Published (International Standard; under periodic systematic review).
• Publication date: First edition — December 1999 (1999-12).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.040.40 (Industrial process measurement and control / building-related information).
• Edition / version: Edition 1 (1999).
• Number of pages: 397 pages (first edition document length as published).

These bibliographic and status details are taken from the ISO bibliographic record for ISO 10303-225:1999.

Scope

Specifies an application protocol for exchanging explicit three‑dimensional shape (boundary representation, constructive solid geometry, swept solids), spatial configuration of building elements, element properties (including materials), classification information, associations of properties/classifications to elements, site shape, specification of spaces and levels, and records for changes/approvals/as‑built information. The AP is scoped to building elements (structural elements, enclosures, services, fixtures, equipment, and spaces) and their roles across design, construction and maintenance phases.

Key topics and requirements

• Explicit 3D shape representations: B‑rep solids, CSG and swept solids for accurate geometry exchange.
• Spatial configuration and assembly relationships of building elements (locations, containment, adjacency).
• Specification of element properties, material composition and property sets.
• Classification metadata and mechanisms to associate classification and properties to elements.
• Support for lifecycle information: design iterations, approvals, change capture and as‑built records.
• Use of STEP integrated resources and EXPRESS-based data schemas to define the AP data model.

Typical use and users

AP 225 is used by software vendors, CAD/CAM/CAE and BIM tool developers, AEC (architecture, engineering, construction) organisations, facility managers and system integrators that need to exchange detailed geometric and property information for building elements between systems. Typical use-cases include model exchange for multidisciplinary coordination (structure, HVAC, plumbing), detailed geometry handoff for analysis or fabrication, and archival/as‑built record keeping. Implementers and conformance-test developers also use the AP when building STEP import/export or data‑management capabilities.

Related standards

ISO 10303-225 is part of the ISO 10303 (STEP) family of standards for product data representation and exchange. Closely related parts and technologies include ISO 10303-21 (STEP physical file / clear-text encoding) and ISO 10303-11 (EXPRESS data-modelling language), which provide the file encoding and schema language used by APs. In the building/BIM space, ISO 16739 (Industry Foundation Classes — IFC) and other BIM standards are complementary exchange approaches; IFC itself references EXPRESS and STEP/Part 21 encodings for some implementations.

Keywords

ISO 10303, AP225, STEP, building elements, explicit shape representation, B‑rep, CSG, swept solids, BIM, building information exchange, EXPRESS, Part 21, geometry exchange, as‑built record.

FAQ

Q: What is this standard?

A: ISO 10303-225:1999 is an application protocol in the ISO 10303 (STEP) family that defines how to represent and exchange explicit geometric shape, property and spatial-configuration information for building elements.

Q: What does it cover?

A: It covers explicit 3D shape models (B‑rep, CSG, swept solids), element properties, classifications, spatial relationships, site and space definitions, and lifecycle-related information such as changes, approvals and as‑built records for building elements.

Q: Who typically uses it?

A: Software vendors, CAD/BIM developers, architects, engineers, construction firms, facility managers and integrators who need accurate geometry and property exchange for building elements across applications and lifecycle phases.

Q: Is it current or superseded?

A: ISO 10303-225 was published as the first edition in December 1999. As with all ISO standards it is subject to periodic review; users should check the ISO catalogue or their national standards body for the current status, revisions or withdrawals.

Q: Is it part of a series?

A: Yes — it is Part 225 of the ISO 10303 family (STEP). AP 225 works alongside other STEP parts (for example Part 21 for file encoding and Part 11 for EXPRESS) and sits within the broader set of application protocols for different domains.

Q: What are the key keywords?

A: Building elements, explicit shape representation, STEP, AP225, B‑rep, CSG, swept solids, geometry exchange, EXPRESS, Part 21, BIM.