http://tcllib.sourceforge.net/doc/asn.html
"Abstract Syntax Notation" in ITU-T X.680 [L1 ]; also note related language specifications [L2 ]. These are all reference materials, largely opaque to humans; we need to mention here also such tutorials as Milan and Dubuisson's [L3 ] and Kaliski's ".. Layman's Guide ..." [L4 ].
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