|Merkmal mit Tabellenwert|
|Property Table Value|
|Propriété à valeurs tabulaires|
|Item||SPF||XML||Change||Description||IFC2x3 to IFC4|
|DefiningValues||MODIFIED||Instantiation changed to OPTIONAL. |
|DefinedValues||MODIFIED||Instantiation changed to OPTIONAL. |
|CurveInterpolation||ADDED||IFC4 Addendum 1|
IfcPropertyTableValue is a property with a value range defined by a property object which has two lists of (numeric or descriptive) values assigned. The values specify a table with two columns. The defining values provide the first column and establish the scope for the defined values (the second column). An optional Expression attribute may give the equation used for deriving the range value, which is for information purposes only.
The IfcPropertyTableValue defines a defining/defined property value combination for which the property name, the table with defining and defined values with measure type (and optional the units for defining and defined values) are given.
NOTE The IfcPropertyTableValue only captures properties that can be expressed by a table with two columns. Use IfcPropertyReferenceValue with the PropertyReference being an IfcTable to express all those properties that require a table with tree or more columns.
The units are handled by the DefiningUnit and DefinedUnit attributes, see Table 694 for an example of a table value property:
The IfcPropertyTableValue allows for the specification of a table of defining/defined value pairs of the property description. The optional attribute CurveInterpolation allows to determine the interval between two given values.
Table 694 — Table value property with values, measure types and units
HISTORY New entity in IFC2x.
IFC4 CHANGE Attributes DefiningValues and DefinedValues have been made OPTIONAL with upward compatibility for file based exchange. The attribute CurveInterpolation has been added.
|3||DefiningValues||IfcValue||~L[1:?]||List of defining values, which determine the defined values. This list shall have unique values only.||X|
|4||DefinedValues||IfcValue||L[1:?]||Defined values which are applicable for the scope as defined by the defining values.||X|
|5||Expression||IfcText||[0:1]||Expression for the derivation of defined values from the defining values, the expression is given for information only, i.e. no automatic processing can be expected from the expression.||X|
|6||DefiningUnit||IfcUnit||[0:1]||Unit for the defining values, if not given, the default value for the measure type (given by the TYPE of the defining values) is used as defined by the global unit assignment at IfcProject.||X|
|7||DefinedUnit||IfcUnit||[0:1]||Unit for the defined values, if not given, the default value for the measure type (given by the TYPE of the defined values) is used as defined by the global unit assignment at IfcProject.||X|
|8||CurveInterpolation||IfcCurveInterpolationEnum||[0:1]||Interpolation of the curve between two defining and defined values that are provided. if not provided a linear interpolation is assumed.||X|
|WR21||Either both DefiningValues and DefinedValues are not provided, or the number of members in the list of DefiningValues shall be the same as the number of members in the list of DefinedValues.|