IfcShell

Natural language names
Hülle
Shell
Enveloppe
Semantic definitions at the type
Type definition

A type comprising different kinds of shell.

NOTE  Definition according to ISO/CD 10303-42:1992
This type collects together, for reference when constructing more complex models, the subtypes which have the characteristics of a shell. A shell is a connected object of fixed dimensionality d = 0; 1; or 2, typically used to bound a region. The domain of a shell, if present, includes its bounds and 0 ≤ Ξ < ∞. > * A shell of dimensionality 0 is represented by a graph consisting of a single vertex. The vertex shall not have any associated edges.

  • A shell of dimensionality 1 is represented by a connected graph of dimensionality 1.
  • A shell of dimensionality 2 is a topological entity constructed by joining faces along edges. Its domain, if present, is a connected, orientable 2-manifold with boundary, that is, a connected, oriented, finite, non-self-intersecting surface, which may be closed or open.

NOTE  Type adapted from shell defined in ISO 10303-42.

HISTORY  New type in IFC2x.

Select definition
TypeDescription
IfcClosedShell
IfcOpenShell
Formal representations
XML Specification
 <xs:group name="IfcShell">
  <xs:choice>
   <xs:element ref="ifc:IfcClosedShell"/>
   <xs:element ref="ifc:IfcOpenShell"/>
  </xs:choice>
 </xs:group>
EXPRESS Specification
TYPE IfcShell = SELECT (
 IfcClosedShell,
 IfcOpenShell);
END_TYPE;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcShellBasedSurfaceModel

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