http://tcllib.sourceforge.net/doc/asn.html
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"Abstract Syntax Notation" in ITU-T X.680
[http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf];
also note related language specifications
[http://www.itu.int/ITU-T/studygroups/com17/languages/].
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