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Reference.org
Geometric Description Language
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<p>In <a href="/facts/Computer-aided_design/5gSXrmmN">computer-aided design</a>, Geometric Description Language (GDL) is the <a href="/facts/Programming_language/cWTYbgWa">programming language</a> of <a href="/facts/Archicad_library_part/bWIluo6r">Archicad library parts</a>. GSM is the <a href="/facts/File_format/qrXbwJaH">file format</a> of these CAD objects. </p>