DOT

DOT is a text markup language created in 2007.

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DOT is a plain text graph description language. DOT graphs are typically files with the file extension gv or dot. The extension gv is preferred to avoid confusion with the extension dot used by early (pre-2007) versions of Microsoft Word. Read more on Wikipedia...

DOT Wikipedia page
DOT docs
There are at least 27,831 DOT repos on GitHub
DOT first developed in AT&T Labs Research
file extensions for DOT include dot and gv
The Google BigQuery Public Dataset GitHub snapshot shows 67 users using DOT in 68 repos on GitHub
ANTLR grammar for DOT
Pygments supports syntax highlighting for DOT
GitHub supports syntax highlighting for DOT
There is 1 Jupyter Kernel for DOT
See also: (6 related languages)JavaScript, Java, Python, Google Cloud Platform, ActionScript, SVG

Example from the web:

 // The graph name and the semicolons are optional
graph graphname {
    a -- b -- c;
    b -- d;
}

Example from Linguist:

/* 
  Huffman Tree DOT graph.

  DOT Reference :  http://www.graphviz.org/doc/info/lang.html
                   http://en.wikipedia.org/wiki/DOT_language
  Timestamp     :  1415989074 
  Phrase        :  'OH GOD WHY IS LINGUIST SO ANAL ABOUT THIS STUFF'

  Generated on http://huffman.ooz.ie/
*/

digraph G {
    edge [label=0];
    graph [ranksep=0];
    T [shape=record, label="{{T|4}|000}"];
    S [shape=record, label="{{S|5}|001}"];
    SPACE [shape=record, label="{{SPACE|9}|01}"];
    A [shape=record, label="{{A|3}|1000}"];
    H [shape=record, label="{{H|3}|1001}"];
    U [shape=record, label="{{U|3}|1010}"];
    L [shape=record, label="{{L|2}|10110}"];
    N [shape=record, label="{{N|2}|10111}"];
    I [shape=record, label="{{I|4}|1100}"];
    O [shape=record, label="{{O|4}|1101}"];
    G [shape=record, label="{{G|2}|11100}"];
    F [shape=record, label="{{F|2}|11101}"];
    GF [label=4];
    W [shape=record, label="{{W|1}|111100}"];
    Y [shape=record, label="{{Y|1}|111101}"];
    B [shape=record, label="{{B|1}|111110}"];
    D [shape=record, label="{{D|1}|111111}"];
    BD [label=2];
    WYBD [label=4];
    GFWYBD [label=8];
    47 -> 18 -> 9 -> T;
    29 -> 13 -> 6 -> A;
    7 -> U;
    4 -> L;
    16 -> 8 -> I;
    GFWYBD -> GF -> G;
    WYBD -> 2 -> W;
    BD -> B;9 -> S [label=1];
    18 -> SPACE [label=1];
    6 -> H [label=1];
    13 -> 7 -> 4 -> N [label=1];
    8 -> O [label=1];
    GF -> F [label=1];
    2 -> Y [label=1];
    47 -> 29 -> 16 -> GFWYBD -> WYBD -> BD -> D [label=1];
}

Example from Wikipedia:

digraph g {
	node [shape=plaintext];
	A1 -> B1;
	A2 -> B2;
	A3 -> B3;
	
	A1 -> A2 [label=f];
	A2 -> A3 [label=g];
	B2 -> B3 [label="g'"];
	B1 -> B3 [label="(g o f)'" tailport=s headport=s];

	{ rank=same; A1 A2 A3 }
	{ rank=same; B1 B2 B3 } 
}

Feature	Supported	Token	Example
MultiLine Comments	✓	/* */	/* A comment */
Comments	✓		// A comment
Line Comments	✓	//	// A comment
Semantic Indentation	X

DOT - Text markup language

Language features