The MBE (Model-based Engineering) PMI Validation and Conformance Testing project supports a Test System to measure conformance of CAD software and derivative STEP, JT, and 3D PDF files to ASME standards for Product and Manufacturing Information (PMI), specifically geometric dimensioning and tolerancing (GD&T) information.
Besides geometric dimensioning and tolerancing, PMI includes 3D annotations, surface texture specifications, finish requirements, process notes, material specifications, welding symbols, and other information. PMI standards define the semantics of the words and symbols used to communicate manufacturing information in 3D computer models. The use of PMI Representation (aka semantic PMI) allows software developers to automate the integration of various design (CAD), manufacturing (CAM), and inspection (CMM) functions. By using the standards the engineering application software associated with these functions can process the PMI directly.
For more details, go to the MBE PMI Validation and Conformance Testing Project (free CAD models and STEP files).