An IfcEvent is something
that happens that triggers an action or response.
HISTORY New entity in IFC4
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
Common Use Definitions
The following concepts are inherited at supertypes:
The Object Typing concept applies to this entity as shown in Table 10.
Table 10 — IfcEvent Object Typing
The IfcEvent defines the anticipated or actual occurrence of
any event; common information about event types is handled
Property Sets for Objects
The Property Sets for Objects concept applies to this entity as shown in Table 11.
Table 11 — IfcEvent Property Sets for Objects
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.
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.
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
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.
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
XSD Specification: <xs:element name="IfcEvent" type="ifc:IfcEvent" substitutionGroup="ifc:IfcProcess" nillable="true"/>
<xs:element name="EventOccurenceTime" type="ifc:IfcEventTime" nillable="true" minOccurs="0"/>
<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"/>
|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));|
|PredefinedType|| : ||
Identifies the predefined types of an event from which
the type required may be set.
|EventTriggerType|| : ||
Identifies the predefined types of event trigger from which
the type required may be set.
|UserDefinedEventTriggerType|| : ||
A user defined event trigger type, the value of which is
asserted when the value of an event trigger type is declared
|EventOccurenceTime|| : ||
The date and/or time at which an event occurs.
|CorrectPredefinedType|| : ||Either the PredefinedType attribute is unset, or the inherited attribute ObjectType must be asserted when the value of PredefinedType is set to USERDEFINED.|
|CorrectTypeAssigned|| : ||Either the EventTriggerType attribute is unset, or the attribute UserDefinedEventTriggerType must be asserted when the value of EventTriggerType is set to USERDEFINED.|
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