German version
Integrated Generic Resources
The Integrated Generic Resources (see table) form the core of STEP. These are information models which describe product data in EXPRESS intependent from a certain application.
| ISO 10303 | Name: | Description: | Status: 05/02 |
| 41 | Fundamentals of Product Description and Support | - | IS |
| - | Generic Product Description Resources | Integration core (structure and context) of STEP, via which all partial models are linked. | - |
| - | Management Resources | Objects for the description of administrative data in the context of an application. | - |
| - | Support Resources | General objects for product description, like identifiers, names, texts, time- and date information, measure units etc. | - |
| 42 | Geometric and Topological Representation | Geometry, topology, shape of 3D objects. | IS |
| 43 | Representation Structures | Specification of the complete structure for representing aspects of product data, like e.g. properties of products (e.g.: representation of geometric elements in a coordinate system). | IS |
| 44 | Product Structure Configuration | Product structure and product configuration. | IS |
| 45 | Materials | Material properties of a product. | IS |
| 46 | Visual Presentation | Representation parameters and -rules for the visual representation of product model data. | IS |
| 47 | Tolerances | Specifies measure-, form- and placement tolerances. | IS |
| 49 | Process Structure and Properties | Defines the logical order of process activities (and their parameters). | IS |
| 50 | Mathematical Constructs | - | FDIS |
| 51 | Mathematical Description | - | CD |
| 52 | Mesh-based topology | - | WD |
| 53 | Numerical Analysis | - | WD |
IS - International Standard
FDIS - Final Draft International Standard
CD - Committee Draft
WD - Working Draft
Latest status see: http://www.nist.gov/sc5/soap/
The EXPRESS schemas defined in the ISO document 10303-41 play an exceptional role. They form the integration core, which links all Resource Models with each other and additionally defines general objects (administrative data, date- and time-stamp, measure values and units).
All other STEP data models must be lead back to the objects defined within the 40-series schemas. A valid modification is the definition of subtpyes, which
 | represent a specialization and |
| define restricting conditions for attributes and relations. |
The introduction of additional attributes is not allowed.
These very restrictive conditions demand for very generic basic models. In numerous developments of application models, the 40-series models have proven their capability.
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Identification and categorization of a product |
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Relationships between products |
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Product definition (shape representation, properties) |
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Application context, in which the product is defined |
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References to documents |
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Actions, demand for actions, status of actions |
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Certification |
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Approval |
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Security classification |
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Validity |
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Contract |
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Person and organization |
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Date and time |
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Grouping mechanisms |
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Referring to information which is defined outside the model |
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Physical quantities and units |
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Structure for the linkage of application and administrative data |
| Point, Vector, |
| Curve (parametric, conic, defined on a parametric surface, general parametric splines, offsets, intersections) |
| Surface (elementary, parametric, general parametric splines, offsets) |
| Transformation operators |
| Representation context |
| Representation items |
| Association of representation items with one or more contexts, in which they jointly represent a concept |
| Relationships between representation items |
| Relationships between representations |
| Re-use of representation items |
| Component and assembly relationships |
| Product variations |
| Structure management for the configuration of assemblies and components, which are planned for manufacturing |
| Decomposition of a product to support various activities during its lifecycle |
| Specification of material properties |
| Association of material properties to a product |
| Qualitative and quantitative conditions for the validity of material properties |
| Material properties for the faces of a product |
| Relationships between product data and visual representations |
| Definition of attributes for realistic and symbolic visualizations of geometric and non-geometric elements of the product information |
| Control of the approximation tolerances for geometric representation items |
| Character- and symbol fonts |
| Support of externally defined character- and symbol fonts |
| Layer mechanisms |
| Nesting of representation areas |
| Tolerances as conditions for surface characteristics of a product |
| Geometric tolerances |
| Plus-minus-tolerances |
| Positioning features |
| Identification of derived attributes (centerline, cut) |
| Structure of limit-and-fit systems |
| Specification of processes |
| Relationships between processes |
| Validity of processes |
| Relationships between process and product |
| Process plan for the realization of a product |
| Alternative process plans |
| Resource specification |
| Process conditions of the resource |
| Identification of the resources, which are used by the process |
| Resource properties |
