Model Element

Overview

Provides information generally about elements that are not the subject of more detailed development in other functional parts.
Many elements in IFC are defined according a consistent pattern. A 'type' defines a set of attributes for many occurrences of an object. This pattern is used for structural elements such as beams and columns (specifically for the non structural view of such members) and for all distribution elements in building services.
Within this functional part, only information that is applicable to all such 'pattern' elements are provided. This includes:

Specification of a name and description for the element if required
Specification of the type applicable to one or more elements
The shape representation of the element
Material from which the element is constructed

Further specification of the type is typically achieved using a type enumeration. To be more precise about the element concerned, it is specified according to its type.

Results

Model of opening occurrence including shape representation and other basic information

Description	Entity/Pset/Functional Part	MAN	REC	OPT
In the descriptions below, IfcElement and IfcElementType are used as placeholders for particular element names (e.g. IfcBeamType/IfcBeam, IfcChillerType/IfcEnergyConversionDevice)
Select the element type	IfcElementType <subtype>
Specify the name of the element type	IfcElementType.Name
Specify a description for the element type	IfcElementType.Description
Set the particular type of the element from the predefined range in the element type enumeration	IfcElementType.PredefinedType
Select the element occurrence	IfcElementType <subtype>
Specify the name of the element occurrence	IfcElement.Name
Specify a description for the element occurrence	IfcElement.Description
Establish the placement of the origin point of the element occurrence	fp_place_object
An element is generally a discrete product having a predefined shape representation (geometry) that can be specified for the type. Provision of a representation map is normally optional within the model but should be asserted for building model exchange. Note that an element type may have many mapped representations.	fp_map_representation
Associate the material with the element	fp_associate_material

IFC Entities Required

IfcElement
IfcElementType
IfcObject
IfcProduct
IfcPropertyDefinition
IfcPropertySetDefinition
IfcPropertySet
IfcRelationship
IfcRelDefines
IfcRelDefinesByProperties
IfcRelDefinesByType
IfcRoot
IfcTypeObject
IfcTypeProduct

IFC Datatypes Required

IfcGloballyUniqueId
IfcIdentifier
IfcLabel
IfcText

IFC Functions Required

-

IFC Property Sets Required

-

IDM Functional Parts Required

fp_apply_owner_history
fp_apply_quantity
fp_associate_material
fp_connects_elements
fp_contains_in_spatial_structure
fp_map_representation
fp_place_object
fp_property
fp_represent_product

EXPRESS Schema

SCHEMA FP_MODEL_ELEMENT;

  TYPE IfcGloballyUniqueId = STRING (22) FIXED;
  END_TYPE;

  TYPE IfcIdentifier = STRING;
  END_TYPE;

  TYPE IfcLabel = STRING;
  END_TYPE;

  TYPE IfcText = STRING;
  END_TYPE;

  ENTITY IfcProduct
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcObject);
      ObjectPlacement : fp_place_object;
      Representation  : fp_represent_product;
    WHERE
      WR1 : (EXISTS(Representation) AND EXISTS(ObjectPlacement))
            OR (EXISTS(Representation) AND 
            (NOT('IFC2X2_FINAL.IFCPRODUCTDEFINITIONSHAPE' IN TYPEOF(Representation))))
            OR (NOT(EXISTS(Representation)));
  END_ENTITY;

  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
      PropertyDefinitionOf : SET [0:1] OF IfcRelDefinesByProperties FOR RelatingPropertyDefinition;
      DefinesType          : SET [0:1] OF IfcTypeObject FOR HasPropertySets;
  END_ENTITY;

  ENTITY IfcRelDefinesByProperties
    SUBTYPE OF(IfcRelDefines);
      RelatingPropertyDefinition : IfcPropertySetDefinition;
  END_ENTITY;

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

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

  ENTITY IfcElement
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcProduct);
      Tag : OPTIONAL IfcIdentifier;
  END_ENTITY;

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

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

  ENTITY IfcTypeProduct
    SUBTYPE OF(IfcTypeObject);
      Tag                : OPTIONAL IfcLabel;
      RepresentationMaps : OPTIONAL SET [1:?] OF fp_map_representation;
    WHERE
      WR41 : NOT(EXISTS(SELF\IfcTypeObject.ObjectTypeOf[1])) OR
             (SIZEOF(QUERY(temp <* SELF\IfcTypeObject.ObjectTypeOf[1].RelatedObjects |
             NOT('IFC2X2_FINAL.IFCPRODUCT' IN TYPEOF(temp)))
             ) = 0);
  END_ENTITY;

  ENTITY IfcElementType
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcTypeProduct);
      ElementType : OPTIONAL IfcLabel;
  END_ENTITY;

  ENTITY fp_apply_owner_history;
  END_ENTITY;

  ENTITY fp_place_object;
  END_ENTITY;

  ENTITY fp_represent_product;
  END_ENTITY;

  ENTITY IfcPropertySet
    SUBTYPE OF(IfcPropertySetDefinition);
      HasProperties : SET [1:?] OF fp_property;
    WHERE
      WR31 : EXISTS(SELF\IfcRoot.Name);
      WR32 : IfcUniquePropertyName(HasProperties);
  END_ENTITY;

  ENTITY fp_property;
  END_ENTITY;

  ENTITY fp_map_representation;
  END_ENTITY;

  ENTITY fp_associate_material;
  END_ENTITY;

  ENTITY fp_apply_quantity;
  END_ENTITY;

  ENTITY fp_contains_in_spatial_structure;
  END_ENTITY;

  ENTITY fp_connects_elements;
  END_ENTITY;

END_SCHEMA;

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