IFC 4.3.x development

8.14.3.10 IfcPresentationLayerWithStyle

Change log

IFC4

additions where_rules ApplicableOnlyToItems
modificationsattributes LayerBlocked definitionChanged from logical to IfcLogical
modificationsattributes LayerFrozen definition Changed from logical to IfcLogical
modificationsattributes LayerOn definition Changed from logical to IfcLogical
modificationsattributes LayerStyles definition Changed from set[0:?] of IfcPresentationStyleSelect to set[0:?] of IfcPresentationStyle

IFC4X1

additionswhere_rulesApplicableOnlyToItems
deletionswhere_rulesApplicableOnlyToItems

IFC4X2

additionswhere_rulesApplicableOnlyToItems
deletionswhere_rulesApplicableOnlyToItems

IFC4X3_RC3

additionswhere_rulesApplicableOnlyToItems
deletionswhere_rulesApplicableOnlyToItems

8.14.3.10.1 Semantic definitions at the entity

An IfcPresentationLayerAssignmentWithStyle extends the presentation layer assignment with capabilities to define visibility control, access control and common style information.

The visibility control allows to define a layer to be either 'on' or 'off', and/or 'frozen' or 'not frozen'. The access control allows to block graphical entities from manipulations by setting a layer to be either 'blocked' or 'not blocked'. Common style information can be given to the layer.

NOTE  Style information assigned to layers is often restricted to 'layer colour', 'curve font', and/or 'curve width'. These styles are assigned by using the IfcCurveStyle within the LayerStyles.

NOTE  If a styled item is assigned to a layer using the IfcPresentationLayerAssignmentWithStyle, it inherits the style information from the layer. In this case, it should omit its own style information. If the styled item has style information assigned (such as by IfcCurveStyle, IfcFillAreaStyle, IfcTextStyle, IfcSurfaceStyle, IfcSymbolStyle), then it overrides the style provided by the IfcPresentationLayerAssignmentWithStyle.

NOTE  The IfcPresentationLayerAssignmentWithStyle extends the presentation_layer_assignment entity as defined in ISO/IS 10303-46:1994, p. 36.

HISTORY  New entity in IFC2x2.

IFC2x3 CHANGE  The attributes have been modified without upward compatibility.

8.14.3.10.1 Attributes

#Attribute Type Description
IfcPresentationLayerAssignment
1Name IfcLabel Name of the layer.
2Description OPTIONAL IfcText Additional description of the layer.
3AssignedItemsSET [1:?] OF IfcLayeredItem The set of layered items, which are assigned to this layer.
4Identifier OPTIONAL IfcIdentifier An (internal) identifier assigned to the layer.
IfcPresentationLayerWithStyle
5LayerOn IfcLogical A logical setting, TRUE indicates that the layer is set to 'On', FALSE that the layer is set to 'Off', UNKNOWN that such information is not available.
6LayerFrozen IfcLogical A logical setting, TRUE indicates that the layer is set to 'Frozen', FALSE that the layer is set to 'Not frozen', UNKNOWN that such information is not available.
7LayerBlocked IfcLogical A logical setting, TRUE indicates that the layer is set to 'Blocked', FALSE that the layer is set to 'Not blocked', UNKNOWN that such information is not available.
8LayerStyles SET [0:?] OF IfcPresentationStyleAssignment of presentation styles to the layer to provide a default style for representation items.

> NOTE  In most cases the assignment of styles to a layer is restricted to an IfcCurveStyle representing the layer curve colour, layer curve thickness, and layer curve type.

> IFC4 CHANGE  The data type has been changed from IfcPresentationStyleSelect (now deprecated) to IfcPresentationStyle.

8.14.3.10.2 Entity inheritance

dot_inheritance IfcPresentationLayerWithStyle IfcPresentationLayerWithStyle IfcPresentationLayerAssignment IfcPresentationLayerAssignment IfcPresentationLayerWithStyle->IfcPresentationLayerAssignment

8.14.3.10.3 Formal representations

ENTITY IfcPresentationLayerWithStyle
 SUBTYPE OF (IfcPresentationLayerAssignment);
	LayerOn : IfcLogical;
	LayerFrozen : IfcLogical;
	LayerBlocked : IfcLogical;
	LayerStyles : SET [0:?] OF IfcPresentationStyle;
 WHERE
	ApplicableOnlyToItems : SIZEOF(QUERY(temp <* AssignedItems | (SIZEOF(TYPEOF(temp) * ['IFC4X3_DEV_a1492713.IfcGeometricRepresentationItem','IFC4X3_DEV_a1492713.IfcMappedItem']) >= 1))) = SIZEOF(AssignedItems);
END_ENTITY;