Introduction

ISO 10303 is an International Standard for the computer-interpretable representation of product information and for the exchange of product data. The objective is to provide a neutral mechanism capable of describing products throughout their life cycle. This mechanism is suitable not only for neutral file exchange, but also as a basis for implementing and sharing product databases, and as a basis for retention and archiving.

Major subdivisions of this document are:

• shape_aspect_definition_schema;
• shape_dimension_schema;
• shape_tolerance_schema.

This part of ISO 10303 specifies the generic integrated resources for the semantic representation of geometrical dimensioning and tolerancing data of products as defined in ISO 129, ISO 286 (all parts), ISO 1101, ISO 2692, ISO 5458, ISO 5459, ISO 8015, ISO 10579, ISO 14405 (all parts), ISO 14660-1 and ISO/TS 17450 (all parts) from Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification and also ASME Y14.5-2009 [11]. It does so by separating the semantic information of existing International Standards on geometric product specification, from the presentation. The provided functionality can be used for different kinds of 2D and 3D geometric data models.

Presentation data for GD&T such as annotations and callouts is not covered in this part of ISO 10303, but is addressed in the resource parts ISO 10303-46 [3], ISO 10303-101 [4], ISO 10303-504 [5], ISO 10303-506 [6] and ISO 10303-520 [8].

The shape aspect definition schema provides resources for the representations of shapes to which geometric dimensions and tolerances are applied. It provides specific support for derived geometry.

The shape dimension schema provides resources for the representations of size and relative location to meet the dimensioning requirements found in engineering design.

The shape tolerance schema provides resources for the representations of limits within which manufactured shapes are permitted to vary.

Note that the terminology used in standards of Technical Committee ISO/TC 213 differs from the terminology in ISO 10303. A line in ISO/TC 213 standards is a curve in ISO 10303. A straight line in ISO/TC 213 is a line in ISO 10303.

The relationships of the schemas in this document to other schemas that define the integrated resources of ISO 10303 are illustrated in Figure 1 using the EXPRESS-G notation. EXPRESS-G is defined in ISO 10303-11.

The schemas illustrated in Figure 1 are components of the integrated resources.

• Figure 1 — Relationship of the EXPRESS schemas defined in this part of ISO 10303

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