NBN EN ISO 4351:2023

This document gives the terminology and basic concepts of association, including objective functions and association constraints and material offset.
This document is not intended to specify association defaults and GPS syntax which are introduced in other (ISO GPS) International Standards.
NOTE            The association can be used to establish for example:
—      a datum;
—      a reference feature for a geometrical specification or for a surface texture specification;
—      an associated toleranced feature;
—      any dimensional characteristic;
—      an intersection plane, an orientation plane, a collection plane or a direction feature.