IfcPresentationLayerWithStyle

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcPresentationLayerWithStyle
LayerStyles	X	X	MODIFIED	Type changed from IfcPresentationStyleSelect to IfcPresentationStyle.
IFC4 Addendum 1
IfcPresentationLayerWithStyle
LayerOn			MODIFIED	Type changed from LOGICAL to IfcLogical.
LayerFrozen			MODIFIED	Type changed from LOGICAL to IfcLogical.
LayerBlocked			MODIFIED	Type changed from LOGICAL to IfcLogical.

Semantic definitions at the entity

Entity definition

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.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
5	LayerOn	IfcLogical	[1:1]	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.	X
6	LayerFrozen	IfcLogical	[1:1]	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.	X
7	LayerBlocked	IfcLogical	[1:1]	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.	X
8	LayerStyles	IfcPresentationStyle	S[0:?]	Assignment 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.	X

Formal Propositions

Rule	Description
ApplicableOnlyToItems	The IfcPresentationLayerWithStyle shall only be used to assign subtypes of IfcGeometricRepresentationItem's and to IfcMappedItem. There shall be no instance of subtypes of IfcRepresentation in the set of AssignedItem's. IFC4 CHANGE New where rule.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcPresentationLayerAssignment
1	Name	IfcLabel	[1:1]	Name of the layer.	X
2	Description	IfcText	[0:1]	Additional description of the layer.	X
3	AssignedItems	IfcLayeredItem	S[1:?]	The set of layered items, which are assigned to this layer.	X
4	Identifier	IfcIdentifier	[0:1]	An (internal) identifier assigned to the layer.	X
IfcPresentationLayerWithStyle
5	LayerOn	IfcLogical	[1:1]	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.	X
6	LayerFrozen	IfcLogical	[1:1]	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.	X
7	LayerBlocked	IfcLogical	[1:1]	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.	X
8	LayerStyles	IfcPresentationStyle	S[0:?]	Assignment 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.	X

Formal representations

XSD Specification

 <xs:element name="IfcPresentationLayerWithStyle" type="ifc:IfcPresentationLayerWithStyle" substitutionGroup="ifc:IfcPresentationLayerAssignment" nillable="true"/>

 <xs:complexType name="IfcPresentationLayerWithStyle">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="LayerStyles">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcPresentationStyle" minOccurs="0" maxOccurs="unbounded"/>

       </xs:sequence>

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

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

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

      </xs:complexType>

     </xs:element>

    </xs:sequence>

    <xs:attribute name="LayerOn" type="ifc:IfcLogical" use="optional"/>

    <xs:attribute name="LayerFrozen" type="ifc:IfcLogical" use="optional"/>

    <xs:attribute name="LayerBlocked" type="ifc:IfcLogical" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcPresentationLayerWithStyle

 SUBTYPE OF (IfcPresentationLayerAssignment);

  LayerOn : IfcLogical;

  LayerFrozen : IfcLogical;

  LayerBlocked : IfcLogical;

  LayerStyles : SET OF IfcPresentationStyle;

 WHERE

  ApplicableOnlyToItems : SIZEOF(QUERY(temp <* AssignedItems | (
  SIZEOF(TYPEOF(temp) * [
    'IFCGEOMETRYRESOURCE.IFCGEOMETRICREPRESENTATIONITEM',
    'IFCGEOMETRYRESOURCE.IFCMAPPEDITEM']) = 1)
)) = SIZEOF(AssignedItems);
END_ENTITY;

 EXPRESS-G diagram

	Zuordnung zu Präsentations-Layer mit Stilvorgaben
	Presentation Layer With Style
	Assignation de calque avec style