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STEP file format is defined by ISO 10303-21 Clear Text Encoding of the Exchange
Structure. There are three editions of ISO 10303-21. First edition was released
in 1994 and last was released in 2016. In last edition added is anchor, reference
and signature sections to support external references, support for compressed exchange
structures in an archive, digital signatures and UTF-8 character encoding.
ISO 10303-21 structure it contains two sections, header and data section. Header
section has fixed structure consisting 3 to 6 groups in given order. The DATA
section contains application data according to one specific express schema encoded
following some simple principles.
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