@startdot
digraph Legend {
  rankdir=LR;
  bgcolor=white;
  subgraph clusterLegend {
    color=black;
    bgcolor=white;
    label = "Legend";

    node [shape=rect, style=filled, color=black, fillcolor=white];

    # C++ Stuff
    CPP [label="Foo.cpp", shape=note, fillcolor=royalblue];
    CPP_LGD [label=": C++ source file", color=none];
    CPP -> CPP_LGD [arrowhead=none, style=invisible];
    LIB [label="Foo.so", shape=component, fillcolor=royalblue];
    LIB_LGD [label=": Shared library (i.e. binary)", color=none];
    LIB -> LIB_LGD [arrowhead=none, style=invisible];

    # Python Stuff
    PYTHON [label="pywrapfoo.py", shape=note, fillcolor=gold];
    PYTHON_LGD [label=": Python source file", color=none];
    PYTHON -> PYTHON_LGD [arrowhead=none, style=invisible];
    PYWRP [label="_pywrapfoo.so", shape=component, fillcolor=gold];
    PYWRP_LGD [label=": C++ wrapper output (i.e. binary)", color=none];
    PYWRP -> PYWRP_LGD [arrowhead=none, style=invisible];
    WHL [label="foo-<version>-cp3*-cp3*-<platform>.whl", shape=folder, fillcolor=gold];
    WHL_LGD [label=": Python package file (i.e. wheel archive)", color=none];
    WHL -> WHL_LGD [arrowhead=none, style=invisible];

    # Links meaning
    A [label="A", shape=note, fillcolor=white];
    B [label="B", shape=note, fillcolor=white];
    CMD_LGD [label=": 'cmd [...] A' will generate file B from A.", color=none];
    A -> B [label="cmd", style=bold];
    B -> CMD_LGD [arrowhead=none, style=invisible];
    C [label="A", shape=note, fillcolor=white];
    D [label="B", shape=note, fillcolor=white];
    REF_LGD [label=": B references file A (i.e. B depends on A)\n'ref' may refer to the keyword use in B.", color=none];
    C -> D [label="ref", style=dashed];
    D -> REF_LGD [arrowhead=none, style=invisible];
    E [label="E", shape=note, fillcolor=white];
    F [label="F", shape=folder, fillcolor=white];
    FOLDER_LGD [label=": Archive F contains file E (i.e. F depends on E).", color=none];
    E -> F [label="pack", style=dashed];
    F -> FOLDER_LGD [arrowhead=none, style=invisible];
  }
}
@enddot
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