IfcEvent

Natural language names
Ereignis
Event
Evènement
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcEventADDED
Semantic definitions at the entity
Entity definition

An IfcEvent is something that happens that triggers an action or response.

HISTORY  New entity in IFC4

Use definitions

IfcEvent is used to capture information about particular things that happen or that may happen. Particularly used in work plans (or process maps) they identify e.g. a point at which a message containing information may be issued or at which a rule or constraint is invoked.

Attribute definitions
#AttributeTypeCardinalityDescription G
8PredefinedTypeIfcEventTypeEnum? Identifies the predefined types of an event from which the type required may be set.X
9EventTriggerTypeIfcEventTriggerTypeEnum? Identifies the predefined types of event trigger from which the type required may be set.X
10UserDefinedEventTriggerTypeIfcLabel? A user defined event trigger type, the value of which is asserted when the value of an event trigger type is declared as USERDEFINED.X
11EventOccurenceTimeIfcEventTime? The date and/or time at which an event occurs.X
Formal Propositions
RuleDescription
CorrectPredefinedTypeEither the PredefinedType attribute is unset, or the inherited attribute ObjectType must be asserted when the value of PredefinedType is set to USERDEFINED.
CorrectTypeAssignedEither the EventTriggerType attribute is unset, or the attribute UserDefinedEventTriggerType must be asserted when the value of EventTriggerType is set to USERDEFINED.
Inherited definitions from supertypes
Entity inheritance IfcProcess IfcObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? 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? 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).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.
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).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.
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.
IFC4 CHANGE  The inverse attribute datatype has been added.
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).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
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).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
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? 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.
IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
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.
IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
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.
IFC4 CHANGE  New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange.
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.
IFC4 CHANGE  The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.
X
IfcProcess
6IdentificationIfcIdentifier? An identifying designation given to a process or activity. It is the identifier at the occurrence level.
IFC4 CHANGE Attribute promoted from subtypes.
X
7LongDescriptionIfcText? An extended description or narrative that may be provided.
IFC4 CHANGE  New attribute.
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
IfcEvent
8PredefinedTypeIfcEventTypeEnum? Identifies the predefined types of an event from which the type required may be set.X
9EventTriggerTypeIfcEventTriggerTypeEnum? Identifies the predefined types of event trigger from which the type required may be set.X
10UserDefinedEventTriggerTypeIfcLabel? A user defined event trigger type, the value of which is asserted when the value of an event trigger type is declared as USERDEFINED.X
11EventOccurenceTimeIfcEventTime? The date and/or time at which an event occurs.X
Definitions applying to General Usage

 Instance diagram


Concept usage

Object Typing

The Object Typing concept template applies to this entity as shown in Table 10.

HasTypeRelatingType
IfcEventType

Table 10 — IfcEvent Object Typing

The IfcEvent defines the anticipated or actual occurrence of any event; common information about event types is handled by IfcEventType.



Property Sets

The Property Sets for Objects concept template applies to this entity as shown in Table 11.

Table 11 — IfcEvent Property Sets for Objects



Nesting

The Object Nesting concept applies to this entity.

IfcEvent may be contained within an IfcTask using the IfcRelNests relationship. The event is considered active during the time period of the enclosing task (including any assigned IfcWorkCalendar); that is such event may be triggered within the task time period but not outside of it. As an IfcEvent is considered to be atomic, no use is anticipated for nesting processes inside the event.



Sequential Connectivity

The Sequential Connectivity concept applies to this entity.

The relationship IfcRelSequence is used to indicate control flow. An IfcEvent as a predecessor (IfcRelSequence.RelatingProcess) indicates that the succeeding process (typically IfcProcedure or IfcTask) is triggered in response to the event. An IfcEvent as a successor (IfcRelSequence.RelatedProcess) indicates that the completion of the preceeding process causes the event to be triggered. As events have zero duration, the IfcRelSequence.SequenceType attribute has no effect on an IfcEvent but still applies to the opposite end of the relationship if IfcTask is used.



Control Assignment

The Control Assignment concept applies to this entity.

An IfcEvent may be assigned to an IfcWorkCalendar to indicate times when such event is active using IfcRelAssignsToControl; otherwise the effective calendar is determined by the nearest IfcProcess ancestor with a calendar assigned.



Product Assignment

The Product Assignment concept applies to this entity.

For building operation scenarios, IfcEvent may be assigned to a product (IfcElement subtype) using IfcRelAssignsToProduct to indicate a specific product occurrence that sources the event.

EXAMPLE  An IfcSensor for a motion sensor may have a "Motion Sensed" event. If the IfcEvent is defined by an IfcEventType and the IfcEventType is assigned to a product type (using IfcRelAssignsToProduct), then the IfcEvent must be assigned to one or more occurrences of the specified product type using IfcRelAssignsToProduct.


mvdXML Specification
<?xml version="1.0"?>
<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="9a2ab9d1-08ba-4ea8-a84d-58e09f2ac59b" name="IfcEvent" status="sample" applicableRootEntity="IfcEvent">
  <Applicability uuid="00000000-0000-0000-0000-000000000000" status="sample">
    <Template ref="cf125ebf-6f17-4850-a17f-aac934b5120b" />
    <TemplateRules operator="and" />
  </Applicability>
  <Concepts>
    <Concept uuid="3ca2a179-a68a-4b61-9c5e-485beb184787" name="Object Typing" status="sample" override="false">
      <Template ref="35a2e10e-20df-40f4-ab2f-dacf0a6744f4" />
      <TemplateRules operator="and">
        <TemplateRule Parameters="RelatingType[Type]='IfcEventType'" />
      </TemplateRules>
    </Concept>
    <Concept uuid="c6574ea2-9c5c-4854-8ea2-28112a690155" name="Property Sets" status="sample" override="false">
      <Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
    </Concept>
    <Concept uuid="c203d56a-56d6-4896-be2c-c122fc6bcc8d" name="Nesting" status="sample" override="false">
      <Template ref="38ca8788-5e47-411c-8294-d56f9e9a5691" />
    </Concept>
    <Concept uuid="6ada702b-6fdf-4c06-a829-0d9db744aba3" name="Sequential Connectivity" status="sample" override="false">
      <Template ref="c9f11880-8cf6-47fe-abac-05c73b4041b1" />
    </Concept>
    <Concept uuid="6c60f112-7269-4de1-9336-ecc0e362158b" name="Control Assignment" status="sample" override="false">
      <Template ref="813e73fe-5641-4648-a680-8887cf4359f1" />
    </Concept>
    <Concept uuid="401817a4-1ed1-4cad-8dc1-f89855248de6" name="Product Assignment" status="sample" override="false">
      <Template ref="ec9cfb04-adfe-4868-8168-d78fe995a913" />
    </Concept>
  </Concepts>
</ConceptRoot>
Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
IfcObjectDefinition
Classification AssociationClassification AssociationGeneral Usage
IfcObject
Object User IdentityObject User IdentityGeneral Usage
Object Predefined TypeObject Predefined TypeGeneral Usage
Property Sets with OverrideProperty Sets with OverrideGeneral Usage
IfcEvent
Object TypingObject TypingGeneral Usage
Property SetsProperty Sets for ObjectsGeneral Usage
NestingObject NestingGeneral Usage
Sequential ConnectivitySequential ConnectivityGeneral Usage
Control AssignmentControl AssignmentGeneral Usage
Product AssignmentProduct AssignmentGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcEvent" type="ifc:IfcEvent" substitutionGroup="ifc:IfcProcess" nillable="true"/>
 <xs:complexType name="IfcEvent">
  <xs:complexContent>
   <xs:extension base="ifc:IfcProcess">
    <xs:sequence>
     <xs:element name="EventOccurenceTime" type="ifc:IfcEventTime" nillable="true" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute name="PredefinedType" type="ifc:IfcEventTypeEnum" use="optional"/>
    <xs:attribute name="EventTriggerType" type="ifc:IfcEventTriggerTypeEnum" use="optional"/>
    <xs:attribute name="UserDefinedEventTriggerType" type="ifc:IfcLabel" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcEvent
 SUBTYPE OF (IfcProcess);
  PredefinedType : OPTIONAL IfcEventTypeEnum;
  EventTriggerType : OPTIONAL IfcEventTriggerTypeEnum;
  UserDefinedEventTriggerType : OPTIONAL IfcLabel;
  EventOccurenceTime : OPTIONAL IfcEventTime;
 WHERE
  CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcEventTypeEnum.USERDEFINED) OR ((PredefinedType = IfcEventTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType));
  CorrectTypeAssigned : NOT(EXISTS(EventTriggerType)) OR (EventTriggerType <> IfcEventTriggerTypeEnum.USERDEFINED) OR ((EventTriggerType = IfcEventTriggerTypeEnum.USERDEFINED) AND EXISTS(UserDefinedEventTriggerType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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