Model Opening

Overview

Provides the information concerning openings made in elements where an opening is considered to include a complete opening through a solid element, a recess or a chase (linear recess cut for cables, pipes etc.)
The information presented in this functional part is sufficient for the exchange of a basic building model.This information includes:

Specification of a name and description for the opening if required
The type of opening modelled (as opening, recess, niche etc.)
The shape representation of the opening formed
Specification of opening types and identification of the type to which an opening occurrence conforms
Purpose of the opening (ventilation opening, access etc.)
Whether or not the opening is a fire exit
Whether or not the opening is a protected opening under fire safety considerations

Note that the dimensions of an opening may be derived from the element that fills the opening (where a fill relationship is applied) or from the shape representation otherwise.

Results

Model of opening occurrence including shape representation and other basic information

Description	Entity/Pset/Functional Part	MAN	REC	OPT
Model the opening An opening is directly specified as an occurrence. It does not have a defining type entity.
Set the global unique identifier	IfcOpeningElement.GlobalId::IfcGloballyUniqueId
Assert the owner history of the equipment type	IfcOpeningElement.OwnerHistory::fp_apply_owner_history
Specify the name of the opening	IfcOpeningElement.Name
Specify a description for the opening	IfcOpeningElement.Description
Specify the type of opening (opening, recess, niche, chase etc.) Note that type of opening is not predefined. It is recommended that a list of acceptable opening types is defined and a value selected from this list.	IfcOpeningElement.ObjectType
Establish the placement of the opening	IfcOpeningElement.ObjectPlacement::fp_place_object
Define the shape representation of the opening Note that the shape representation of an opening is usually given by a swept solid whose axis is usually normal to the plane of the element in which the opening is placed. Shape representation may also be given as a boundary representation.	IfcOpeningElement.Representation::fp_represent_product
Specify the element in which the opening element creates an opening	IfcElement<subtype>
Assert the relationship by which the opening element creates the opening	fp_voids[element,opening_element]
Specify an element that fills the opening where a fill relationship is to be asserted.	IfcElement<subtype>
Assert the relationship by which the element fills the opening	fp_fills[opening_element,element]
Set values in the property set Pset_OpeningElementCommon as indicated below.
Reference type of opening from the list defined for the project	Pset_OpeningElementCommon.Reference
Set the purpose of the opening (ventilation, access etc.) Note that purpose of opening is not predefined. It is recommended that a list of acceptable opening purposes is defined and a value selected from this list.	Pset_OpeningElementCommon.Purpose
Indication of whether the opening is to be used as a fire exit. If so, the value should be set to TRUE	Pset_OpeningElementCommon.FireExit
Indication of whether the opening is to be a protected opening under fire safety considerations If so, the value should be set to TRUE (default should be set to FALSE)	Pset_OpeningElementCommon.ProtectedOpening
Indication of whether the edges of an opening in a curved element are parallel or radial. If parallel, the value is set to TRUE and this should be considered as the default condition	Pset_OpeningElementCommon.ParallelJambs
Define the property set for the opening	fp_define_by_properties
Additional quantities may be applied to a slab but are not specified within this functional part. Quantities may be provided according to particular methods of measurement applied in different locations.	fp_apply_quantity[xxx]

IFC Entities Required

IfcElement
IfcFeatureElement
IfcFeatureElementSubtraction
IfcObject
IfcOpeningElement
IfcProduct
IfcRoot

IFC Datatypes Required

IfcGloballyUniqueId
IfcIdentifier
IfcLabel
IfcText

IFC Functions Required

-

IFC Property Sets Required

Pset_OpeningElementCommon

IDM Functional Parts Required

fp_apply_owner_history
fp_define_by_properties
fp_fills
fp_place_object
fp_represent_product
fp_voids

EXPRESS Schema

SCHEMA FP_MODEL_OPENING;

  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;
    WHERE
      WR1 : SIZEOF(QUERY(temp <* IsDefinedBy | 'IFC2X2_FINAL.IFCRELDEFINESBYTYPE' IN TYPEOF(temp))) <= 1;
  END_ENTITY;

  ENTITY IfcRoot
    ABSTRACT SUPERTYPE;
      GlobalId     : IfcGloballyUniqueId;
      Name         : OPTIONAL IfcLabel;
      Description  : OPTIONAL IfcText;
      OwnerHistory : fp_apply_owner_history;
    UNIQUE
      UR1 : GlobalId;
  END_ENTITY;

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

  ENTITY IfcFeatureElement
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcElement);
  END_ENTITY;

  ENTITY IfcFeatureElementSubtraction
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcFeatureElement);
  END_ENTITY;

  ENTITY IfcOpeningElement
    SUBTYPE OF(IfcFeatureElementSubtraction);
  END_ENTITY;

  ENTITY fp_apply_owner_history;
  END_ENTITY;

  ENTITY fp_place_object;
  END_ENTITY;

  ENTITY fp_represent_product;
  END_ENTITY;

  ENTITY fp_define_by_properties;
  END_ENTITY;

  ENTITY fp_fills;
  END_ENTITY;

  ENTITY fp_voids;
  END_ENTITY;

END_SCHEMA;

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