X-Nico

unusual facts about ISO 10303-21


Wirth syntax notation

WSN has been used in several international standards, starting with ISO 10303-21.


Boundary representation

In the world of data-exchange, STEP, the Standard for the Exchange of Product Model data also defines some data models for boundary representations.

Gellish English

For example, it can be implemented as SQL database tables, as XML data stores, as collections of RDF triples, as STEPfiles (according to ISO 10303-21), or as one or more simple spreadsheet tables.

ISO 10303

IDEF1X diagrams documented the AP of early APs in an informal way.

Non-uniform rational B-spline

NURBS are commonly used in computer-aided design (CAD), manufacturing (CAM), and engineering (CAE) and are part of numerous industry wide standards, such as IGES, STEP, ACIS, and PHIGS.


see also