IfcProcedure

Natural language names
deVorgehen
enProcedure
frProcédure
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcProcedure
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      IdentificationXMODIFIEDName changed from ProcedureID to Identification.
Instantiation changed to OPTIONAL.
      LongDescriptionXXMODIFIEDName changed from ProcedureType to LongDescription.
Type changed from IfcProcedureTypeEnum to IfcText.
Instantiation changed to OPTIONAL.
      PredefinedTypeXXMODIFIEDName changed from UserDefinedProcedureType to PredefinedType.
Type changed from IfcLabel to IfcProcedureTypeEnum.
Semantic definitions at the entity
Entity definition

An IfcProcedure is a logical set of actions to be taken in response to an event or to cause an event to occur.

HISTORY  New entity in IFC2x2
IFC4 CHANGE  ProcedureType renamed to PredefinedType and made optional (upward compatible). Where rules WR1 and WR2 have been removed.

Use definitions

IfcProcedure is used to capture information about stepped processes such as calibration, start/stop procedures for equipment items, designated actions to take in the event of an emergency etc. A procedure is not a task, but may describe a set of tasks and their order of occurrence in response to or to cause an event.

As shown in Figure 11, IfcProcedure does not restrict anything but describes specific steps of how something should happen. While a procedure does control/restrict in the sense of indicating "this is how the task should be performed" by nature of describing inner detail, this is not different than parts of a product indicating "this is how the parts should be assembled". Consequently, it doesn't restrict the outer item as a whole but provides inner detail of the item.

procedure example

Figure 128 — Procedure relationships

Attribute definitions
#AttributeTypeCardinalityDescription C
8PredefinedTypeIfcProcedureTypeEnum[0:1] Identifies the predefined types of a procedure from which the type required may be set.X
Formal Propositions
RuleDescription
HasNameThe Name attribute should be inserted to describe the task name.
CorrectPredefinedTypeEither the PredefinedType attribute is unset, or the inherited attribute ObjectType must be asserted when the value of PredefinedType is set to USERDEFINED.
Inherited definitions from supertypes
Entity inheritance IfcProcess IfcObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionC
IfcRoot
1GlobalIdIfcGloballyUniqueId[1:1] Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory[0:1] Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
NOTE  only the last modification in stored - either as addition, deletion or modification.
X
3NameIfcLabel[0:1] Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. X
4DescriptionIfcText[0:1] Optional description, provided for exchanging informative comments.X
IfcObjectDefinition
HasAssignmentsIfcRelAssigns
@RelatedObjects
S[0:?]Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.X
NestsIfcRelNests
@RelatedObjects
S[0:1]References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only). X
IsNestedByIfcRelNests
@RelatingObject
S[0:?]References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types). X
HasContextIfcRelDeclares
@RelatedDefinitions
S[0:1]References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object. X
IsDecomposedByIfcRelAggregates
@RelatingObject
S[0:?]References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts). X
DecomposesIfcRelAggregates
@RelatedObjects
S[0:1]References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only). X
HasAssociationsIfcRelAssociates
@RelatedObjects
S[0:?]Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.X
IfcObject
5ObjectTypeIfcLabel[0:1] The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.
X
IsDeclaredByIfcRelDefinesByObject
@RelatedObjects
S[0:1]Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes. X
DeclaresIfcRelDefinesByObject
@RelatingObject
S[0:?]Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes. X
IsTypedByIfcRelDefinesByType
@RelatedObjects
S[0:1]Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type. X
IsDefinedByIfcRelDefinesByProperties
@RelatedObjects
S[0:?]Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object. X
IfcProcess
6IdentificationIfcIdentifier[0:1] An identifying designation given to a process or activity. It is the identifier at the occurrence level. X
7LongDescriptionIfcText[0:1] An extended description or narrative that may be provided. X
IsPredecessorToIfcRelSequence
@RelatingProcess
S[0:?]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. X
IsSuccessorFromIfcRelSequence
@RelatedProcess
S[0:?]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. X
OperatesOnIfcRelAssignsToProcess
@RelatingProcess
S[0:?]Set of relationships to other objects, e.g. products, processes, controls, resources or actors, that are operated on by the process.X
IfcProcedure
8PredefinedTypeIfcProcedureTypeEnum[0:1] Identifies the predefined types of a procedure from which the type required may be set.X
Definitions applying to Common Use Definitions

 Instance diagram


Concept usage

Object Typing

The Object Typing concept applies to this entity as shown in Table 12.

Type
IfcProcedureType

Table 12 — IfcProcedure Object Typing

IfcProcedure defines the anticipated or actual occurrence of any procedure; common information about procedure types is handled by IfcProcedureType.



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 13.

PredefinedTypeNameProperties
 Pset_RiskSingle Value
NameValue
NatureOfRiskIfcLabel
SubNatureOfRisk1IfcLabel
SubNatureOfRisk2IfcLabel
RiskCauseIfcText
AffectsSurroundingsIfcBoolean
Enumerated Value
NameValueValue
RiskTypeIfcLabelIfcLabel
AssessmentOfRiskIfcLabelIfcLabel
RiskConsequenceIfcLabelIfcLabel
RiskRatingIfcLabelIfcLabel
RiskOwnerIfcLabelIfcLabel

Table 13 — IfcProcedure Property Sets for Objects



Object Nesting

The Object Nesting concept applies to this entity.

The IfcProcedure may be contained within an IfcTask or IfcProcedure using the IfcRelNests relationship. An IfcProcedure may in turn nest other IfcProcedure or IfcEvent entities. Such nesting indicates decomposed level of detail.



Sequential Connectivity

The Sequential Connectivity concept applies to this entity.

The relationship IfcRelSequence is used to indicate control flow. An IfcProcedure as a successor to an IfcEvent indicates that the procedure should be performed in response to the event. An IfcProcedure as a predecessor to an IfcEvent indicates that the event should be trigerred following the procedure. As procedures have arbitrary duration, the IfcRelSequence.SequenceType attribute has no effect on an IfcProcedure but still applies to the opposite end of the relationship if IfcTask is used.



Process Assignment

The Process Assignment concept applies to this entity.

NOTE  A particular type of IfcProcedure is a caution, warning or other form of advisory note. Typically, it is anticipated that such a procedure would be assigned to the specific IfcProcess for which it gives advice using IfcRelAssignsToProcess.


Control Assignment

The Control Assignment concept applies to this entity.

An IfcProcedure may be assigned to an IfcWorkCalendar to indicate times when such procedure may be performed using IfcRelAssignsToControl; otherwise the effective calendar is determined by the nearest IfcProcess ancestor with a calendar assigned. Advisory notes should be assigned to the specific IfcProcess for which it gives advice using IfcRelAssignsToProcess.



Product Assignment

The Product Assignment concept applies to this entity.

For building operation scenarios, IfcProcedure may be assigned to a product (IfcElement subtype) using IfcRelAssignsToProduct to indicate a specific product occurrence that performs the procedure.

EXAMPLE  An IfcActuator may have a "Close" procedure. If the IfcProcedure is defined by an IfcProcedureType and the IfcProcedureType is assigned to a product type (using IfcRelAssignsToProduct), then the IfcProcedure must be assigned to one or more occurrences of the specified product type using IfcRelAssignsToProduct.


Concept inheritance

#ConceptModel View
IfcRoot
Software IdentityCommon Use Definitions
Revision ControlCommon Use Definitions
IfcObject
Object Occurrence Predefined TypeCommon Use Definitions
IfcProcess
IfcProcedure
Object TypingCommon Use Definitions
Property Sets for ObjectsCommon Use Definitions
Object NestingCommon Use Definitions
Sequential ConnectivityCommon Use Definitions
Process AssignmentCommon Use Definitions
Control AssignmentCommon Use Definitions
Product AssignmentCommon Use Definitions
Formal representations
XSD Specification
 <xs:element name="IfcProcedure" type="ifc:IfcProcedure" substitutionGroup="ifc:IfcProcess" nillable="true"/>
 <xs:complexType name="IfcProcedure">
  <xs:complexContent>
   <xs:extension base="ifc:IfcProcess">
    <xs:attribute name="PredefinedType" type="ifc:IfcProcedureTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcProcedure
 SUBTYPE OF (IfcProcess);
  PredefinedType : OPTIONAL IfcProcedureTypeEnum;
 WHERE
  HasName : EXISTS(SELF\IfcRoot.Name);
  CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcProcedureTypeEnum.USERDEFINED) OR ((PredefinedType = IfcProcedureTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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