IFC 4.3.x development

5.3.3.10 IfcWorkPlan

Change log

IFC4

additionsattributes PredefinedType
additionswhere_rulesCorrectPredefinedType

5.3.3.10.1 Semantic definitions at the entity

An IfcWorkPlan represents work plans in a construction or a facilities management project.

HISTORY  New entity in IFC2.0

A work plan contains a set of work schedules for different purposes (including construction and facilities management). Contained work schedules are defined through the IfcRelAggregates relationship. Through inheritance from IfcWorkControl it is also possible to define references to activities (for example, IfcTask) and resources used in the work plan.

A work plan has information such as start date, finish date, total free float, and so on. IfcWorkPlan can also refer to the construction project represented by the single IfcProject instance (please also check the definition of IfcWorkControl).

Figure 1 shows the backbone structure of a work plan that defines (1) contained work schedules through IfcRelAggregates and (2), if not assigned otherwise to contained work schedules, assigned tasks and resources through IfcRelAssignsToControl.

If an assigned IfcTask is a root-level task, such task must be declared on the IfcProject using the IfcRelDeclares relationship.

dot_figure cluster_0 Project cluster_1 Work Plan cluster_2 Work Schedules cluster_3 Plan Summary Task IfcProject IfcProject IfcRelDeclares IfcRelDeclares IfcProject->IfcRelDeclares RelatingContext IfcWorkPlan IfcWorkPlan IfcRelDeclares->IfcWorkPlan RelatedDefinitions IfcRelAggregates IfcRelAggregates IfcWorkPlan->IfcRelAggregates RelatingObject IfcRelAssignsToControl IfcRelAssignsToControl IfcWorkPlan->IfcRelAssignsToControl RelatingControl IfcWorkSchedule IfcWorkSchedule IfcRelAggregates->IfcWorkSchedule RelatedObjects IfcTask IfcTask IfcRelAssignsToControl->IfcTask RelatedObjects

5.3.3.10.1 Attributes

# Attribute Type Description
IfcRoot
1 GlobalId IfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world.
2 OwnerHistory OPTIONAL IfcOwnerHistory 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.
3 Name OPTIONAL IfcLabel 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.
4 Description OPTIONAL IfcText Optional description, provided for exchanging informative comments.
IfcObjectDefinition
HasAssignments SET [0:?] OF IfcRelAssigns FOR RelatedObjects 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.
Nests SET [0:1] OF IfcRelNests FOR RelatedObjects 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.
IsNestedBy SET [0:?] OF IfcRelNests FOR RelatingObject 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.
HasContext SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions 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.
IsDecomposedBy SET [0:?] OF IfcRelAggregates FOR RelatingObject 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.
Decomposes SET [0:1] OF IfcRelAggregates FOR RelatedObjects 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.
HasAssociationsSET [0:?] OF IfcRelAssociates FOR RelatedObjects 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.
IfcObject
5 ObjectType OPTIONAL IfcLabel 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.
IsDeclaredBy SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects 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.
Declares SET [0:?] OF IfcRelDefinesByObject FOR RelatingObject 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.
IsTypedBy SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects 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.
IsDefinedBy SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjectsSet 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.
IfcControl
6 Identification OPTIONAL IfcIdentifier An identifying designation given to a control

It is the identifier at the occurrence level.



> IFC4 CHANGE Attribute unified by promoting from various subtypes of IfcControl.
Controls SET [0:?] OF IfcRelAssignsToControl FOR RelatingControl Reference to the relationship that associates the control to the object(s) being controlled.
IfcWorkControl
7 CreationDate IfcDateTime The date that the plan is created.
8 Creators OPTIONAL SET [1:?] OF IfcPerson The authors of the work plan.
9 Purpose OPTIONAL IfcLabel A description of the purpose of the work schedule.
10 Duration OPTIONAL IfcDuration The total duration of the entire work schedule.
11 TotalFloat OPTIONAL IfcDuration The total time float of the entire work schedule.
12 StartTime IfcDateTime The start time of the schedule.
13 FinishTime OPTIONAL IfcDateTime The finish time of the schedule.
IfcWorkPlan
14 PredefinedType OPTIONAL IfcWorkPlanTypeEnum Identifies the predefined types of a work plan from which

the type required may be set.

5.3.3.10.2 Entity inheritance

dot_inheritance IfcWorkPlan IfcWorkPlan IfcWorkControl IfcWorkControl IfcWorkPlan->IfcWorkControl IfcWorkSchedule IfcWorkSchedule IfcWorkSchedule->IfcWorkControl IfcControl IfcControl IfcWorkControl->IfcControl IfcControl_children 7 more... IfcControl_children->IfcControl IfcObject IfcObject IfcControl->IfcObject IfcObject_children 5 more... IfcObject_children->IfcObject IfcObjectDefinition IfcObjectDefinition IfcObject->IfcObjectDefinition IfcContext IfcContext IfcContext->IfcObjectDefinition IfcRoot IfcRoot IfcObjectDefinition->IfcRoot IfcTypeObject IfcTypeObject IfcTypeObject->IfcObjectDefinition IfcPropertyDefinition IfcPropertyDefinition IfcPropertyDefinition->IfcRoot IfcRelationship IfcRelationship IfcRelationship->IfcRoot

5.3.3.10.3 Definitions applying to General Usage

5.3.3.10.3.1 Classification Association

Any object occurrence or object type can have a reference to a specific classification reference, i.e. to a particular facet within a classification system.

5.3.3.10.3.2 Control Assignment

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.

5.3.3.10.3.3 Identity

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

5.3.3.10.3.4 Object Predefined Type

5.3.3.10.3.5 Object Typing

Any object occurrence can be typed by being assigned to a common object type utilizing this concept. A particular rule, restricting the applicable subtypes of IfcTypeObject that can be assigned, is introduced by overriding this concept at the level of subtypes of IfcObject.

5.3.3.10.3.6 Object User Identity

An attribute Name and optionally Description can be used for all subypes of IfcObject. For those subtypes, that have an object type definition, such as ifcBeam - IfcBeamType, the common Name and optionally Description is associated with the object type.

5.3.3.10.3.7 Property Sets

5.3.3.10.3.8 Property Sets for Objects

PsetName
'Pset_WorkControlCommon'

5.3.3.10.3.9 Property Sets with Override

Any object occurrence can hold property sets, either directly at the object occurrence as element specific property sets, or at the object type, as type property sets. In this case, the properties that are provided to the object occurrence are the combinations of element specific and type properties. In case, that the same property (within the same property set, is defined both, in occurrence and type properties, the property value of the occurrence property overrides the property value of the type property.

5.3.3.10.3.10 Revision Control

Ownership, history, and merge state is captured using IfcOwnerHistory.

5.3.3.10.4 Formal representations

ENTITY IfcWorkPlan
 SUBTYPE OF (IfcWorkControl);
	PredefinedType : OPTIONAL IfcWorkPlanTypeEnum;
 WHERE
	CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcWorkPlanTypeEnum.USERDEFINED) OR
((PredefinedType = IfcWorkPlanTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType));
END_ENTITY;