STEP File entity documentation

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I have a STEP 3D file and when I open through notepad, Its lot of entities and I gone through http://www.steptools.com/support/stdev_docs/express/step_irs/html/schema.html#geometry_schema but I could not understand the entities. Is there a documentation that explains these entities? If so it would be really helpful to understand.

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user3015252 On

The recommended practice for STEP AP 203 is a good place to start.

The CAX-IF recommended practices may also be useful, along with the schemas and file library.

If you need more information, the STEP Module and Resource Library can be purchased from ISO.