Services Building

Overview

Describes a connection relationship between a system and a spatial structure element in which the system may have a connection with one or more different spatial structure elements.

Spatial structure elements include sites, buildings, building storeys and individual spaces. A system may be related to as many spatial structure elements as required by specifying multiple system/spatial structure element relationships.

In a services building connection, the system is referred to as the 'relating system' whilst the spatial structure elements being serviced are referred to as the 'related buildings' (note that the reference to buildings in the attribute relates to earlier versions of the IFC model where a system could only service occurrences of IfcBuilding ; from IFC 2x2, the relationship allows for servicing of occurrences of IfcSpatialStructureElement. The attribute name was retained for reasons of upward compatibility of IFC toolbox software) . There is always exactly one relating system and there may be one or many related buildings.

Results

Declares the connection between a system and spatial structure element

Description	Entity/Pset/Functional Part	MAN	REC	OPT
Set the occurrence of the system entity in the relationship	IfcSystem
Ensure that the system is named appropriately Although provision of a name is optional, it is recommended that a name should be provided. Where the system occurrence is an instance of a particular type of group (e.g. system) it strongly recommended that the name be selected from a predetermined list that has been agreed with other persons/organizations who will be using the system information.	IfcSystem.Name::IfcLabel
Set the occurrences of the spatial structure elements that will be serviced by the system	IfcSpatialStructureElement <subtypes>
Assert the relating system	IfcRelServicesBuildings.RelatingSystem::IfcSystem
Assert the related spatial structure elements	IfcRelServicesBuildings.RelatedBuildings::IfcSpatialStructureElement <subtypes>
Assert general attributes for the relationship
Set the global unique identifier	IfcRelServicesBuildings.GlobalId::IfcGloballyUniqueId
Assert the owner history of the fitting type	IfcRelServicesBuildings.OwnerHistory::fp_apply_owner_history
Specify a name of the fitting type	IfcRelServicesBuildings.Name::IfcLabel
Specify a description of the fitting type	IfcRelServicesBuildings.Description::IfcText

IFC Entities Required

IfcGroup
IfcObject
IfcProduct
IfcRelationsip
IfcRelConnect
IfcRelServicesBuildings
IfcRoot
IfcSpatialStructureElement
IfcSystem

IFC Datatypes Required

IfcElementCompositionEnum
IfcGloballyUniqueId
IfcLabel
IfcText

IFC Functions Required

-

IFC Property Sets Required

-

IDM Functional Parts Required

fp_apply_owner_history
fp_place_object
fp_represent_product

Note that fp_place_object and fp_represent_product are included in this schema as they represent attributes of IfcProduct. They are not however asserted within this functional part.

EXPRESS-G

EXPRESS Schema

SCHEMA FP_SERVICES_BUILDING;

  TYPE IfcGloballyUniqueId = STRING (22) FIXED;
  END_TYPE;

  TYPE IfcLabel = STRING;
  END_TYPE;

  TYPE IfcText = STRING;
  END_TYPE;

  TYPE IfcElementCompositionEnum = ENUMERATION OF
    (COMPLEX,
     ELEMENT,
     PARTIAL);
  END_TYPE;

  ENTITY IfcProduct
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcObject);
      ObjectPlacement : OPTIONAL fp_place_object;
      Representation  : OPTIONAL 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 OF (ONEOF(IfcGroup, IfcProduct))
    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 OF (ONEOF(IfcObject, IfcRelationship));
      GlobalId     : IfcGloballyUniqueId;
      Name         : OPTIONAL IfcLabel;
      Description  : OPTIONAL IfcText;
      OwnerHistory : fp_apply_owner_history;
    UNIQUE
      UR1 : GlobalId;
  END_ENTITY;

  ENTITY fp_apply_owner_history;
  END_ENTITY;

  ENTITY IfcSpatialStructureElement
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcProduct);
      LongName          : OPTIONAL IfcLabel;
      CompositionType   : IfcElementCompositionEnum;
    INVERSE
      ServicedBySystems : SET OF IfcRelServicesBuildings FOR RelatedBuildings;
    WHERE
      WR41 : (HIINDEX(SELF\IfcObject.Decomposes) = 1) 
             AND
             ('IFC2X2_FINAL.IFCRELAGGREGATES' IN TYPEOF(SELF\IfcObject.Decomposes[1])) 
             AND
             (('IFC2X2_FINAL.IFCPROJECT' IN TYPEOF (SELF\IfcObject.Decomposes[1].RelatingObject)) OR
             ('IFC2X2_FINAL.IFCSPATIALSTRUCTUREELEMENT' IN TYPEOF (SELF\IfcObject.Decomposes[1].RelatingObject))
             );
  END_ENTITY;

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

  ENTITY IfcRelServicesBuildings
    SUBTYPE OF(IfcRelConnects);
      RelatingSystem   : IfcSystem;
      RelatedBuildings : SET [1:?] OF IfcSpatialStructureElement;
  END_ENTITY;

  ENTITY IfcSystem
    SUBTYPE OF(IfcGroup);
    INVERSE
      ServicesBuildings : SET [0:1] OF IfcRelServicesBuildings FOR RelatingSystem;
    WHERE
      WR1 : SIZEOF (QUERY (temp <* SELF\IfcGroup.IsGroupedBy.RelatedObjects |  NOT('IFC2X2_FINAL.IFCELEMENT' IN TYPEOF(temp)))) = 0;
  END_ENTITY;

  ENTITY IfcGroup
    SUBTYPE OF(IfcObject);
  END_ENTITY;

  ENTITY fp_place_object;
  END_ENTITY;

  ENTITY fp_represent_product;
  END_ENTITY;

  ENTITY IfcRelationship
    SUBTYPE OF(IfcRoot);
  END_ENTITY;

END_SCHEMA;

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