Define By Type

Overview

Used to define the type object that sets the type for an occurrence.
The occurrence is defined as a legal subtype of IfcObject. Within this functional part, the decomposition of IfcObject into the legal set of entities whose type can be defined is not undertaken. The general assumption is that any subtype of IfcObject can be type type defined.

Results

The type of an object is defined.

Description	Entity/Pset/Functional Part	MAN	REC	OPT
Select the entities for which properties are to be defined	IfcObject <subtypes>
Define the property sets that are to be contained by the type object	IfcTypeObject.HasPropertySets::IfcPropertySet
Specify the type object to be used as the type specification for the objects	IfcRelDefinesByType.RelatingType ::TypeObject (IfcPropertySet is the subtype target in fp_define_property_set)
Specify the set of objects whose type is to be defined	IfcRelDefinesByType.RelatedObjects::IfcObject
Set the global unique identifier	IfcRelDefinesByType.GlobalId::IfcGloballyUniqueId
Assert the owner history of the relationship	IfcRelDefinesByType.OwnerHistory::fp_apply_owner_history
Specify a name of the relationship	IfcRelDefinesByType.Name::IfcLabel
Specify a description of the relationship	IfcRelDefinesByType.Description::IfcText

IFC Entities Required

IfcObject
IfcPropertyDefinition
IfcPropertySetDefinition
IfcRelationship
IfcRelDefines
IfcRelDefinesByType
IfcRoot
IfcTypeObject

IFC Datatypes Required

IfcGloballyUniqueId
IfcLabel
IfcText

IFC Functions Required

-

IDM Functional Parts Required

fp_apply_owner_history
fp_define_property_set

EXPRESS Schema

SCHEMA FP_DEFINE_BY_TYPE;

  TYPE IfcGloballyUniqueId = STRING (22) FIXED;
  END_TYPE;

  TYPE IfcLabel = STRING;
  END_TYPE;

  TYPE IfcText = STRING;
  END_TYPE;

  ENTITY IfcObject
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRoot);
      ObjectType  : OPTIONAL IfcLabel;
    INVERSE
      IsDefinedBy : SET OF IfcRelDefines FOR RelatedObjects;
    WHERE
      WR1 : SIZEOF(QUERY(temp <* IsDefinedBy | 'IFC2X2_FINAL.IFCRELDEFINESBYTYPE' IN TYPEOF(temp))) <= 1;
  END_ENTITY;

  ENTITY IfcRoot
    ABSTRACT SUPERTYPE OF (ONEOF(IfcObject, IfcPropertyDefinition, IfcRelationship));
      GlobalId     : IfcGloballyUniqueId;
      Name         : OPTIONAL IfcLabel;
      Description  : OPTIONAL IfcText;
      OwnerHistory : fp_apply_owner_history;
    UNIQUE
      UR1 : GlobalId;
  END_ENTITY;

  ENTITY IfcPropertyDefinition
    ABSTRACT SUPERTYPE OF (ONEOF(IfcPropertySetDefinition, IfcTypeObject))
    SUBTYPE OF(IfcRoot);
  END_ENTITY;

  ENTITY IfcPropertySetDefinition
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcPropertyDefinition);
    INVERSE
      DefinesType : SET [0:1] OF IfcTypeObject FOR HasPropertySets;
  END_ENTITY;

  ENTITY IfcRelDefines
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRelationship);
      RelatedObjects : SET [1:?] OF IfcObject;
  END_ENTITY;

  ENTITY IfcRelationship
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRoot);
  END_ENTITY;

  ENTITY IfcRelDefinesByType
    SUBTYPE OF(IfcRelDefines);
      RelatingType : IfcTypeObject;
  END_ENTITY;

  ENTITY IfcTypeObject
    SUBTYPE OF(IfcPropertyDefinition);
      ApplicableOccurrence : OPTIONAL IfcLabel;
      HasPropertySets      : OPTIONAL LIST [1:?] OF UNIQUE IfcPropertySetDefinition;
    INVERSE
      ObjectTypeOf         : SET [0:1] OF IfcRelDefinesByType FOR RelatingType;
    WHERE
      WR1 : EXISTS(SELF\IfcRoot.Name);
  END_ENTITY;

  ENTITY fp_apply_owner_history;
  END_ENTITY;

  ENTITY fp_define_property_set
    SUBTYPE OF(IfcPropertySetDefinition);
  END_ENTITY;

END_SCHEMA;

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