Graphvizで凡例付きクラス図

Graphvizで凡例付きクラス図を書く。図案はダイアグラム別 UML徹底活用 (翔泳社) より引用

図 Graphvizでクラス図

digraph sample {
  graph [fontname = "monospace", fontsize = 10, ranksep = 1, nodesep = 1];
  node  [fontname = "monospace", fontsize = 10];
  edge  [fontname = "monospace", fontsize = 10];

  // node
  node             [shape = record];
  membership       [label = "{会員|名前\l生年月日\l入会日\l会員番号\l住所\l|登録情報の変更\l}"];
  rental           [label = "{貸出|貸出日\l貸出期間\l金額\l|作品の貸出\l}"];
  net_rental       [label = "{ネット貸出||作品の貸出\l}"];
  rental_substance [label = "{貸し出し実体|貸出番号\l媒体\l|登録情報の変更\l}"];
  goods            [label = "{作品|作品名\l時間\l監督\l出演者\l|登録情報の変更\l}"];

  // edge
  membership       -> rental [dir = none, headlabel = "貸出\n1",       label = "借りている", taillabel = "借主\n0..*",       labeldistance = 2];
  membership       -> rental [dir = none, headlabel = "過去の貸出\n1", label = "借りた",     taillabel = "過去の借主\n0..*", labeldistance = 1.2];
  rental_substance -> goods  [dir = none, headlabel = "仕様\n1", taillabel = "棚に置かれた実体\n0..*", labeldistance = 1.2];

  edge [arrowhead = onormal];
  net_rental -> rental;

  edge                       [arrowhead = odiamond];
  rental_substance -> rental [headlabel = "貸出先\n0..*", taillabel = "貸出対象\n1..*", labeldistance = 3];

  // rank
  {rank = same; rental; rental_substance}
  {rank = same; net_rental; goods}

  // legend
  subgraph cluster_legend {
    label = "凡例";

    // node
    node   [shape = record];
    class1 [label = "{クラス1|メンバa\l|メソッドx\l}"];
    class2 [label = "{クラス2|メンバb\l|メソッドy\l}"];
    class3 [label = "{クラス3|メンバc\l|メソッドz\l}"];

    // edge
    edge             [arrowhead = none];
    class1 -> class3 [dir = none, label = "関連名", taillabel = "ロール名\ni..j(多重度)", labeldistance = 2];

    edge             [arrowhead = none];
    class2 -> class1 [arrowtail     = onormal,
                      arrowhead     = now,
                      label         = "継承",
                      headlabel     = "サブクラス",
                      taillabel     = "スーパークラス",
                      labeldistance = 2];

    edge             [arrowhead = odiamond];
    class2 -> class3 [label = "集約"];
  }
}