5.1.3.9 IfcProcess

Processus
Prozess (allgemein)

IfcProcess is defined as one individual activity or event, that is ordered in time, that has sequence relationships with other processes, which transforms input in output, and may connect to other other processes through input output relationships. An IfcProcess can be an activity (or task), or an event. It takes usually place in building construction with the intent of designing, costing, acquiring, constructing, or maintaining products or other and similar tasks or procedures. Figure 93 illustrates process relationships.

NOTE  Definition according to ISO9000:
A process is a set of activities that are interrelated or that interact with one another. Processes use resources to transform inputs into outputs. Processes are interconnected because the output from one process becomes the input for another process. In effect, processes are "glued" together by means of such input output relationships.
icon diagram

Figure 93 — Process relationships and the ICON process diagram.

HISTORY  New entity in IFC1.0.
IFC2x CHANGE  The attribute Productivity has been removed.
IFC4 CHANGE  The attribute Identification has been promoted from subtypes IfcTask and others.

Relationship use definition

Process information relates to other objects by establishing the following relationships:


Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 3.
PredefinedTypeName
 Pset_Risk

Table 3 — IfcProcess Property Sets for Objects




XSD Specification:

 <xs:element name="IfcProcess" type="ifc:IfcProcess" abstract="true" substitutionGroup="ifc:IfcObject" nillable="true"/>
 <xs:complexType name="IfcProcess" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcObject">
    <xs:attribute name="Identification" type="ifc:IfcIdentifier" use="optional"/>
    <xs:attribute name="LongDescription" type="ifc:IfcText" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcProcess
ABSTRACT SUPERTYPE OF(ONEOF(IfcEvent, IfcProcedure, IfcTask))
SUBTYPE OF IfcObject;
Identification : OPTIONAL IfcIdentifier;
LongDescription : OPTIONAL IfcText;
INVERSE
IsPredecessorTo : SET OF IfcRelSequence FOR RelatingProcess;
IsSuccessorFrom : SET OF IfcRelSequence FOR RelatedProcess;
OperatesOn : SET OF IfcRelAssignsToProcess FOR RelatingProcess;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

Identification : An identifying designation given to a process or activity. It is the identifier at the occurrence level.
IFC4 CHANGE Attribute promoted from subtypes.
LongDescription : An extended description or narrative that may be provided.
IFC4 CHANGE  New attribute.
IsPredecessorTo : Dependency between two activities, it refers to the subsequent activity for which this activity is the predecessor. The link between two activities can include a link type and a lag time.
IsSuccessorFrom : Dependency between two activities, it refers to the previous activity for which this activity is the successor. The link between two activities can include a link type and a lag time.
OperatesOn : Set of relationships to other objects, e.g. products, processes, controls, resources or actors, that are operated on by the process.

Inheritance Graph:

ENTITY IfcProcess
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
INVERSE
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties FOR RelatedObjects;
ENTITY IfcProcess
Identification : OPTIONAL IfcIdentifier;
LongDescription : OPTIONAL IfcText;
INVERSE
IsPredecessorTo : SET OF IfcRelSequence FOR RelatingProcess;
IsSuccessorFrom : SET OF IfcRelSequence FOR RelatedProcess;
OperatesOn : SET OF IfcRelAssignsToProcess FOR RelatingProcess;
END_ENTITY;

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