IfcWorkControl

Semantic definitions at the entity

Entity definition

An IfcWorkControl is an abstract supertype which captures information that is common to both IfcWorkPlan and IfcWorkSchedule.

HISTORY New entity in IFC2x

CHANGE IFC4 Corrected assignment of resources to work control in documentation. Assignment of tasks to work control updated based on changes of task time definitions and the introduction of a summary task. Identifier has been renamed (now Identification) and promoted to supertype IfcControl

A work control may have resources assigned to it. This is handled by the IfcRelAssignsToControl relationship. A work control should also define a context that gives further information about its usage. If no special context information is required then the IfcProject instance as a global context should be used instead. An explicit link between the work control and the IfcProject via IfcRelDeclares should then be provided.

The attribute IfcWorkControl.Purpose is used to define the purpose of either a work schedule or a work plan. In the case of IfcWorkPlan, the purpose attribute can be used to determine if the work plan is for cost estimating, task scheduling or some other defined purpose.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
7	CreationDate	IfcDateTime	[1:1]	The date that the plan is created.	X
8	Creators	IfcPerson	S[1:?]	The authors of the work plan.	X
9	Purpose	IfcLabel	[0:1]	A description of the purpose of the work schedule.	X
10	Duration	IfcDuration	[0:1]	The total duration of the entire work schedule.	X
11	TotalFloat	IfcDuration	[0:1]	The total time float of the entire work schedule.	X
12	StartTime	IfcDateTime	[1:1]	The start time of the schedule.	X
13	FinishTime	IfcDateTime	[0:1]	The finish time of the schedule.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[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
3	Name	IfcLabel	[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
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @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
	Nests	IfcRelNests @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
	IsNestedBy	IfcRelNests @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
	HasContext	IfcRelDeclares @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
	IsDecomposedBy	IfcRelAggregates @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
	Decomposes	IfcRelAggregates @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
	HasAssociations	IfcRelAssociates @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
5	ObjectType	IfcLabel	[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
	IsDeclaredBy	IfcRelDefinesByObject @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
	Declares	IfcRelDefinesByObject @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
	IsTypedBy	IfcRelDefinesByType @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
	IsDefinedBy	IfcRelDefinesByProperties @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
IfcControl
6	Identification	IfcIdentifier	[0:1]	An identifying designation given to a control It is the identifier at the occurrence level.	X
	Controls	IfcRelAssignsToControl @RelatingControl	S[0:?]	Reference to the relationship that associates the control to the object(s) being controlled.	X
IfcWorkControl
7	CreationDate	IfcDateTime	[1:1]	The date that the plan is created.	X
8	Creators	IfcPerson	S[1:?]	The authors of the work plan.	X
9	Purpose	IfcLabel	[0:1]	A description of the purpose of the work schedule.	X
10	Duration	IfcDuration	[0:1]	The total duration of the entire work schedule.	X
11	TotalFloat	IfcDuration	[0:1]	The total time float of the entire work schedule.	X
12	StartTime	IfcDateTime	[1:1]	The start time of the schedule.	X
13	FinishTime	IfcDateTime	[0:1]	The finish time of the schedule.	X

Definitions applying to Common Use Definitions

Instance diagram

Concept usage

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 17.

PredefinedType

Name

Properties

Pset_WorkControlCommon

Single Value

Name	Value
WorkStartTime	IfcTime
WorkFinishTime	IfcTime
WorkDayDuration	IfcDuration
WorkWeekDuration	IfcDuration
WorkMonthDuration	IfcDuration

Table 17 — IfcWorkControl Property Sets for Objects

Control Assignment

The Control Assignment concept applies to this entity.

From IFC4 onwards the assignment of tasks to the work control is handled by the IfcRelAssignsToControl relationship. IfcRelAssignsTasks as used in previous IFC releases has been deleted and can not be used any longer. Another change in IFC4 is that it is not necessary to assign each task to a work control as it is regarded to be sufficient if the summary task (root task in the task hierarchy defined through IfcRelNests relationships) is assigned to a work control.

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Common Use Definitions
	Revision Control	Common Use Definitions
IfcObject
	Object Occurrence Predefined Type	Common Use Definitions
IfcControl
IfcWorkControl
	Property Sets for Objects	Common Use Definitions
	Control Assignment	Common Use Definitions

Formal representations

XSD Specification

 <xs:element name="IfcWorkControl" type="ifc:IfcWorkControl" abstract="true" substitutionGroup="ifc:IfcControl" nillable="true"/>

 <xs:complexType name="IfcWorkControl" abstract="true">

  <xs:complexContent>

   <xs:extension base="ifc:IfcControl">

    <xs:sequence>

     <xs:element name="Creators" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcPerson" maxOccurs="unbounded"/>

       </xs:sequence>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcPerson"/>

       <xs:attribute ref="ifc:cType" fixed="set"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

    <xs:attribute name="CreationDate" type="ifc:IfcDateTime" use="optional"/>

    <xs:attribute name="Purpose" type="ifc:IfcLabel" use="optional"/>

    <xs:attribute name="Duration" type="ifc:IfcDuration" use="optional"/>

    <xs:attribute name="TotalFloat" type="ifc:IfcDuration" use="optional"/>

    <xs:attribute name="StartTime" type="ifc:IfcDateTime" use="optional"/>

    <xs:attribute name="FinishTime" type="ifc:IfcDateTime" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcWorkControl

 ABSTRACT SUPERTYPE OF(ONEOF(IfcWorkPlan, IfcWorkSchedule))

 SUBTYPE OF (IfcControl);

  CreationDate : IfcDateTime;

  Creators : OPTIONAL SET [1:?] OF IfcPerson;

  Purpose : OPTIONAL IfcLabel;

  Duration : OPTIONAL IfcDuration;

  TotalFloat : OPTIONAL IfcDuration;

  StartTime : IfcDateTime;

  FinishTime : OPTIONAL IfcDateTime;

END_ENTITY;

 EXPRESS-G diagram

Link to this page

	Arbeitskontrolle
	Work Control
	Contrôle des travaux