ISO 10303-520-1999 PDF

Full title and description

Industrial automation systems and integration — Product data representation and exchange — Part 520: Application interpreted construct: Associative draughting elements (ISO 10303-520:1999). This part of ISO 10303 (STEP) defines an application‑interpreted construct for associating draughting annotations and callouts with the geometric aspects of product shape geometry.

Abstract

ISO 10303-520:1999 specifies the integrated resource constructs necessary to support associative draughting elements within the STEP framework. It describes structures to associate draughting annotation (dimensions, callouts, area boundaries, etc.) with the geometry or annotations of the target product shape so that annotation remains linked to model geometry during data exchange and reuse.

General information

• Status: Withdrawn (original edition withdrawn and later revised).
• Publication date: 9 December 1999 (Edition 1, 1999).
• 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 (1999).
• Number of pages: 26 pages.

Scope

This part of ISO 10303 defines an application‑interpreted construct to describe associative draughting elements used in technical drawings and annotations, including associations between dimensions or draughting callouts and their target product geometry, and associations between area boundaries and the product shape geometry or originating annotations. It is focused on the data constructs required for exchanging and preserving these associations in STEP representations.

Key topics and requirements

• Definition of application‑interpreted constructs to represent associative draughting elements within STEP.
• Data structures and integrated resource constructs for linking annotations (dimensions, callouts) to product geometry.
• Rules for representing area boundaries and their derivation from geometry or annotations.
• Compatibility with other ISO 10303 parts and EXPRESS/STEP data modelling conventions to enable reliable data exchange.
• Requirements for preserving annotation–geometry associations during import/export between CAD and downstream systems.

Typical use and users

Used by CAD implementers, PLM and PDM integrators, technical documentation authors, and standards engineers who need to exchange or archive drawings with persistent, machine‑readable associations between annotations and geometry. Typical applications include CAD data exchange, automated drafting tools, and downstream manufacturing/documentation workflows that rely on retained annotation semantics.

Related standards

Part of the ISO 10303 (STEP) family; related parts include other application protocols and resource definitions that handle geometric representations, product structure and drawing semantics (for example ISO 10303‑214 and other STEP AP/resource parts). The 1999 edition was later revised (AP/part 520 updated in 2011 and again in 2018).

Keywords

STEP, ISO 10303, associative draughting, draughting elements, annotation–geometry association, product data representation, EXPRESS, data exchange, CAD interoperability.

FAQ

Q: What is this standard?

A: ISO 10303‑520:1999 is Part 520 of the ISO 10303 STEP series, titled "Application interpreted construct: Associative draughting elements", which defines data constructs to represent and exchange associative draughting information.

Q: What does it cover?

A: It covers the data model and constructs needed to associate draughting annotations (dimensions, callouts, area boundaries) with the corresponding shape geometry so those associations are preserved during STEP-based data exchange.

Q: Who typically uses it?

A: CAD software vendors, PLM/PDM integrators, technical documentation and drafting tool developers, and standards/implementation teams that require reliable exchange of annotated drawings with preserved semantic links to geometry.

Q: Is it current or superseded?

A: The 1999 edition is withdrawn and has been revised. It was superseded by a 2011 edition (ISO 10303‑520:2011) and later by ISO 10303‑520:2018 (current published edition as of the 2018 revision). Specific lifecycle and revision notices are documented by ISO and national bodies.

Q: Is it part of a series?

A: Yes — it is part of the ISO 10303 family (commonly called STEP), a multi‑part standard for product data representation and exchange; Part 520 specifically addresses associative draughting constructs and interacts with other APs and resources in the series.

Q: What are the key keywords?

A: STEP, associative draughting, annotation, callouts, dimensions, product data exchange, EXPRESS, ISO 10303, CAD interoperability.