Constructional relations are relations between geometrical objects and
parameters which are defined by pre-determined constructional rules.
For this purpose SISCAD-P distinguishes between
Constructing objects are those objects which are taken for the
construction of one or more objects.
Constructed objects are those objects which are created during a
construction with the help of other objects.
Constructional relations are a powerful tool for the creation of variant
constructions. This tool has to be carefully used, because the manipulation
of the geometrical objects which have been saved for constructional
relations is restricted.