IfcClassificationNotation

Definition from IAI: An IfcClassificationNotation is a notation used from published reference (which may be either publicly available from a classification society or is published locally for the purposes of an organization, project or other purpose).

> HISTORY: New class in IFC Release 1.5. It has changed in IFC Release 2x. Documentation corrections made in IFC 2x Addendum 1

### Use Definitions

A classification notation may be developed using various notation facets. A facet is a part of the actual notation but which has a specific meaning. For instance, it may be appropriate to classify an item by owning actor (represented by A=Architect) and by an entry from a classification table such as CI/SfB (represented by 210 for external wall). This gives a classification as A210.

All classifications of an object that are contained within the IFC model are made through the IfcClassificationNotation class. For a given object, the IfcRelAssociatesClassification class makes the connection between the IfcObject and the IfcClassificationNotation.

It is a requirement that a classification notation can only bring together facets from the same classification system or source. Bringing together notation facets from different sources within the same classification notation is not allowed. However, multiple classifications can be applied to a single object through the use of more than one instance of IfcRelAssociatesClassification. In this way it is possible to define multiple classification notations where each notation contains facets from a single source.

EXPRESS specification:

ENTITY IfcClassificationNotation;
NotationFacets | : | SET [1:?] OF IfcClassificationNotationFacet;
END_ENTITY;

Attribute definitions:

NotationFacets | : | Alphanumeric characters in defined groups from which the classification notation is derived.

Inheritance graph

ENTITY IfcClassificationNotation;
ENTITY IfcClassificationNotation;
NotationFacets | : | SET [1:?] OF IfcClassificationNotationFacet;
END_ENTITY;