Modeling and constraint

An image of a gap style go nogo
                  gauge, for external measurements (such as the
                  diameter of a shaft being produced by a lathe). It
                  looks sort of like a small C-clamp with two
                  jaws (instead of just
                  one).

Gauge photograph taken by Glenn McKechnie, 2005-03-26, available via CC-by-sa-2.0 license.

Understanding the TEI Architecture, slide 1 of 16