Creating and Editing IFC Data

Note: To avoid errors (and to keep the standard property definition rules), do not use the standard “Pset” prefix when giving a name to your custom Property Sets.
REAL type value of the extent of a surface. Value must be set in square meters, but is recalculated at export based on Area Unit settings (see Export Options).
A defined data type of simple BOOLEAN type. Value: TRUE or FALSE.
An identifier is an alphanumeric STRING (max. 255 characters) which allows an individual thing to be identified. It may not provide natural-language meaning.
A defined data type of simple INTEGER type. The number of bits contained in the IfcInteger is unrestricted, but in practice it is implementation-specific.
A label is the term by which something may be referred to. It is a STRING (max. 255 characters) which represents the human-interpretable name of something and shall have a natural-language meaning.
REAL type value of a distance. Value must be set in meters, but is recalculated at export based on Length Unit settings (see Export Options).
A defined data type of simple LOGICAL type. Value: TRUE, FALSE or UNKNOWN.
REAL type value of an amount of money without regard to its currency. The currency unit can be set at Currency Unit settings (see Export Options).
REAL type value of an angle in a plane. Value must be set in radians, but is recalculated at export based on Angle Unit settings (see Export Options).
REAL type value of the relation between two physical quantities that are of the same kind. Input given in percent is expressed as a decimal value: e.g. 25% becomes 0.25.
A defined data type of simple REAL type. The domain of Real is all rational, irrational and scientific real numbers. Here the precision is unconstrained, but in practice it is implementation-specific.
Alphanumeric STRING of characters which is intended to be read and understood by a human being. It is for information purposes only. No character number limitation.
REAL type value of the duration of time periods. The time unit can be set at Time Unit settings (see Export Options).
REAL type value of the solid content of a body. Value must be set in cubic meters, but is recalculated at export based on Volume Unit settings (see Export Options).
Note: All other “Measure”-type properties not listed in the above table are handled and exported without any unit settings.
To create a new Assignment, do the following in the IFC Manager:
Note: “Reset Type” means that all edited IFC data will revert to their original values, and the new data will be deleted.
Combining doors or windows is more complicated, because some of their major parameters are generated from GDL data, and cannot be modified as a result of combining elements. Such parameters are the OperationType Attribute and the panel and lining attributes. Suppose you have two doors that are identical in all their data (e.g. size, panel type), but their Operation Types are different: one opens to the right, the other to the left. These two doors will be classified under two different IFC Type Products: these two Types will have the same name, but their “OperationType” IFC Attributes will differ. To have both doors belong to the same IFC Type Product, select one of the doors and place it in the other (second) type. As a result, a new, common type is created that uses all of the non-generated data of the second type (such as Name Attribute, Properties, Classification Reference, etc.). This new common type is the one that will be exported, and which will be assigned to both of the doors. This common type can be renamed and its data modified. At the same time, the two original types will remain as so-called linked types, and will link to the elements only data which is generated and which differ for each of the two doors (in this case, their OperationType Attributes). In other words, both doors will belong to a single type, which includes all of the data they have in common, but they will also maintain certain IFC data that were different for each and cannot be combined (see illustration below).
4.
Click Apply. The Classification Reference elements and Properties are generated for the Space Occupant, using the values corresponding to the selected classification item.
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