Definition
Constructed geometry (such as center point, axis, median plane, gage plane, etc) is very often used to define the theoretical dimensions of parts or products (framed dimensioning).
These constructed elements do represent the tolerancing feature (user surface and group of surfaces features) and are used to define the tolerance zone position of geometrical tolerances, the related position of the datums of a datum reference frame, the size, and position of a partial surface or a datum target.
The existing geometry is the represented geometry, and the constructed geometry is the representing geometry.
Query an annotation created on a constructed geometry (created automatically or managed manually) highlights automatically the constructed geometry itself and its related geometry.