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STEP
STEP, the Standard for the Exchange of Product Model Data,
is a comprehensive ISO standard (ISO 10303) that describes
how to represent and exchange digital product information.
STEP-NC
STEP-NC is a worldwide standard developed by the International
Standards Organization (ISO) to extend STEP so that it can
be used to define data for NC (numeric control) machines.
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Online EXPRESS Schemas
Fundamentals of STEP Implementation [pdf]
Efficient DB Implementation
of EXPRESS info models
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