MDL is a historical programming language created in 1971. MDL (the MIT Design Language) is a descendant of the Lisp programming language. Its initial purpose was to provide high level language support for the Dynamic Modeling Group at MIT's Project MAC. It was initially developed in 1971 on the PDP-10 computer under the Incompatible Timesharing System. Read more on Wikipedia...

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Example code from Wikipedia:

<DEFINE EXIT-TO (EXITS RMS)
        #DECL ((EXITS) EXIT (RMS) <UVECTOR [REST ROOM]>)
        <MAPF <>
              <FUNCTION (E)
                 #DECL ((E) <OR DIRECTION ROOM CEXIT NEXIT DOOR>)
                 <COND (<TYPE? .E DIRECTION>)
                       (<AND <TYPE? .E ROOM> <MEMQ .E .RMS>>
                        <MAPLEAVE T>)
                       (<AND <TYPE? .E CEXIT> <MEMQ <2 .E> .RMS>>
                        <MAPLEAVE T>)
                       (<AND <TYPE? .E DOOR>
                             <OR <MEMQ <DROOM1 .E> .RMS>
                                 <MEMQ <DROOM2 .E> .RMS>>>
                        <MAPLEAVE T>)>>
              .EXITS>>

Last updated December 10th, 2019

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