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/usr/share/highlight/langDefs/graphviz.lang is in highlight-common 3.8-2.

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The actual contents of the file can be viewed below.

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-- Language definition generated by lang2to3

Description="Graphviz"

Keywords={
  { Id=1,
    List={"digraph", "graph", "node", "edge", "subgraph", "strict"},
  },
  { Id=2,
    List={"bottomlabel", "color", "comment", "distortion", "fillcolor", "fixedsize", "fontcolor", "fontname", "fontsize", "group", "height", "label", "layer", "orientation", "peripheries", "regular", "shape", "shapefile", "sides", "skew", "style", "toplabel", "width", "z", "arrowhead", "arrowsize", "arrowtail", "color", "comment", "constraint", "decorate", "dir", "fontcolor", "fontname", "fontsize", "headlabel", "headport", "headurl", "label", "labelangle", "labeldistance", "labelfloat", "labelfontcolor", "labelfontname", "labelfontsize", "layer", "lhead", "ltail", "minlen", "samehead", "sametail", "style", "taillabel", "tailport", "tailurl", "weight", "bgcolor", "center", "clusterrank", "color", "comment", "compound", "concentrate", "fillcolor", "fontcolor", "fontname", "fontpath", "fontsize", "label", "labeljust", "labelloc", "layers", "margin", "mclimit", "nodesep", "nslimit", "nslimitl", "ordering", "orientation", "page", "pagedir", "quantum", "rank", "rankdir", "ranksep", "ratio", "remincross", "rotate", "samplepoints", "searchsize", "size", "style", "url", "splines"},
  },
  { Id=3,
    List={"none", "normal", "inv", "dot", "odot", "invdot", "invodot", "open", "halfopen", "empty", "invempty", "diamond", "odiamond", "box", "obox", "tee", "crow", "box", "polygon", "ellipse", "circle", "point", "egg", "triangle", "plaintext", "diamond", "trapezium", "parallelogram", "house", "hexagon", "octagon", "doublecircle", "doubleoctagon", "tripleoctagon", "invtriangle", "invtrapezium", "invhouse", "mdiamond", "msquare", "mcircle", "record", "mrecord", "epsf", "turquoise", "antiquewhite", "coral", "darkgoldenrod", "azure", "crimson", "gold", "bisque", "darksalmon", "goldenrod", "aliceblue", "blanchedalmond", "deeppink", "greenyellow", "blue", "cornsilk", "firebrick", "lightgoldenrod", "blueviolet", "floralwhite", "hotpink", "lightgoldenrodyellow", "cadetblue", "gainsboro", "indianred", "lightyellow", "cornflowerblue", "ghostwhite", "lightpink", "palegoldenrod", "darkslateblue", "honeydew", "lightsalmon", "yellow", "deepskyblue", "ivory", "maroon", "yellowgreen", "dodgerblue", "lavender", "mediumvioletred", "indigo", "lavenderblush", "orangered", "lightblue", "lemonchiffon", "palevioletred", "chartreuse", "lightskyblue", "linen", "pink", "darkgreen", "lightslateblue", "mintcream", "red", "darkolivegreen", "mediumblue", "mistyrose", "salmon", "darkseagreen", "mediumslateblue", "moccasin", "tomato", "forestgreen", "midnightblue", "navajowhite", "violetred", "green", "navy", "oldlace", "greenyellow", "navyblue", "papayawhip", "browns", "lawngreen", "powderblue", "peachpuff", "beige", "lightseagreen", "royalblue", "seashell", "brown", "limegreen", "skyblue", "snow", "burlywood", "mediumseagreen", "slateblue", "thistle", "chocolate", "mediumspringgreen", "steelblue", "wheat", "darkkhaki", "mintcream", "white", "khaki", "olivedrab", "whitesmoke", "peru", "palegreen", "blueviolet", "rosybrown", "seagreen", "darkorchid", "saddlebrown", "springgreen", "darkviolet", "darkslategray", "sandybrown", "yellowgreen", "magenta", "dimgray", "sienna", "mediumorchid", "gray", "tan", "mediumpurple", "gray", "aquamarine", "mediumvioletred", "lightgray", "oranges", "cyan", "orchid", "lightslategray", "darkorange", "darkturquoise", "palevioletred", "slategray", "orange", "lightcyan", "plum", "orangered", "mediumaquamarine", "purple", "mediumturquoise", "violet", "black", "paleturquoise", "violetred", "true", "solid", "dashed", "dotted", "bold", "invis", "filled", "diagonals"},
  },
}

Strings={
  Delimiter=[["]],
}

IgnoreCase=true

Comments={
  { Block=false,
    Delimiter= { [[//]] },
  },
  { Block=true,
    Nested=false,
    Delimiter= { [[\/\*]],[[\*\/]],}
  }
}

Operators=[[\(|\)|\{\}|\-|\>|\<|\:|\.|\;|\,]]