ISO 13584-31:1999

Overview - ISO 13584-31:1999 (Geometric programming interface)

ISO 13584-31:1999 is part of the ISO 13584 series for parts libraries and specifies an application programming interface (API) for generating geometric models that are independent of the target user system. The standard enables portability of programs that describe parametric shape representations of part families stored in an ISO 13584 parts library. It defines logical and implementation resources so CAD/modelling systems can receive, interpret and render parametric geometry consistently across platforms.

Key topics and technical requirements

• Portable geometric API: Defines an interface to create geometric models independent of a specific CAD system, supporting reuse of programmatic shape descriptions.
• Parametric and constraint-based definitions: Supports generation of models created via parameters and constraint-based geometric definitions.
• Representation structure: Rules for structuring geometric representations created externally (groups, entities, temporary databases).
• Presentation attributes: Mechanisms for specifying presentation style for symbolic visualization (line styles, fill areas, annotation).
• Technical drawing conventions: Support for technical drawing behaviors including a 2D hidden-line removal mechanism.
• Logical model and entity types: Includes an abstract schema (api_abstract_schema) covering geometric primitives and higher-level items (points, curves, surfaces, representation_context, geometric_representation_item).
• Conformance and error handling: Defines allowed implementation levels, simulation strategies for missing entities, and interface error states.
• Out of scope: Precise control of device display, exact data layout on the receiving system, and storage of the parametric model on the receiver.

Applications and practical value

• Ensures interoperability between parts libraries and diverse CAD/CAM/CAE systems by enabling exchange of parametric shape programs.
• Enables software vendors and integrators to deliver portable part-family generators that work across modelling systems.
• Useful in product lifecycle management (PLM), digital catalog distribution, automated part configuration, and manufacturing preparation workflows.
• Reduces duplication of modelling effort, speeds up library deployment, and supports consistent visual and 2D drawing outputs across platforms.

Who should use this standard

• CAD/CAM/CAE developers implementing import/export or plugin interfaces.
• Library suppliers creating parametric part families for broad distribution.
• System integrators and LMS (library management system) implementers working to standardize part geometry exchange.
• PLM and manufacturing engineers focused on automated configuration and consistent technical drawings.

Related standards

• ISO 13584 family (parts library standards) - see ISO 13584-10 and other parts for complementary definitions, data models and part-property specifications.