This diagram shows the integrated definitions used by STEP and STEP-NC models. In a STEP file, each ARM concept is stored as one or more instances of the integrated definitions — low-level details like cartesian points and bspline curves that are combined to describe concepts like product shape. Like a normalized database, these are designed to be stable for the long term (20+ years) and general enough for use with new ARM concepts as they appear.
These SVG diagrams are best viewed with Chrome or Firefox, which support clicking on the relationships and definitions to navigate through the diagram or jump to the definitions. Edge and Safari display diagrams but do not yet have full SVG support for following links within the diagram.