In a .rvt/.rfa file, each element can have a set of parameters. Each parameter
stores a value, which can be one of four data types (int, double, OdString,
or OdObjectId) and defines the value of some property of the element.
Some of them can be computed from other ones (e.g., volume of a wall).
Some of them are read-only, and other ones can be changed.
Some of them affect only one project, while other ones can affect several projects.