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283 Stars 95 Forks Other 2.3K Commits 58 Opened issues


STEPcode (formerly NIST's STEP Class Library) is used with IFC, STEP, and other standards that utilize the technologies of ISO10303 (STEP). It generates C++ and Python from EXPRESS (10303-11) schemas. The code is capable of reading and writing STEP Part 21 exchange files. It also utilizes Parts 22 and 23 (SDAI and its C++ binding).

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STEPcode v0.8 --

  • What is STEPcode? SC reads ISO10303-11 EXPRESS schemas and generates C++ source code that can read and write Part 21 files conforming to that schema. In addition to C++, SC includes experimental support for Python.

  • Renamed in April/May 2012: SC was formerly known as STEP Class Libraries, SCL for short. It was renamed because the name wasn't accurate: the class libraries make up only a part of the code.

  • Much of the work to update SC has been done by the developers of BRL-CAD, and SC (then STEP Class Library) was originally created at NIST in the 90's.

  • For information on changes version-by-version, see the NEWS file

  • Building and testing SCL - see the INSTALL file

  • For more details on the libraries and executables, see the wiki:

  • For license details, see the COPYING file. Summary: 3-clause BSD.


SC's source has been reformatted with astyle. When making changes, try to match the current formatting. The main points are:

  • compact (java-style) brackets:
    if( a == 3 ) {
        c = 5;
        function( a, b );
    } else {
        somefunc( );
  • indents are 4 spaces
  • no tab characters
  • line endings are LF (linux), not CRLF (windows)
  • brackets around single-line conditionals
  • spaces inside parentheses and around operators
  • return type on the same line as the function name, unless that's too long
  • doxygen-style comments (see

If in doubt about a large patch, run astyle with the config file misc/astyle.cfg. Download astyle from

For more info, see the wiki.

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