インテリジェントレイアウトを備えた強化されたデータフローダイアグラム（DFD）生成の紹介

digraph DFD {
    // --- グラフスタイル ---
    graph [
        rankdir = LR
        splines = true
        overlap = false
        nodesep = 0.5
        ranksep = 0.8
        fontname = "Helvetica,Arial,sans-serif"
        fontsize = 12
    ]

    // --- ノードスタイル ---
    node [
        fontname = "Helvetica,Arial,sans-serif"
        fontsize = 11
        penwidth = 1.5
    ]

    // 外部エンティティ
    node [shape = box, style = "filled", fillcolor = "#E1F5FE", color = "#0288D1"]
    Passenger; AirlineOperator; PaymentGateway; Admin;

    // --- システム境界コンテナ ---
    subgraph cluster_SystemBoundary {
        label = "航空券予約システム";
        fontname = "Helvetica,Arial,sans-serif"
        fontsize = 14
        color = "#757575"
        style = "dashed,rounded"
        bgcolor = "#FAFAFA"
        margin = 20

        // 処理
        node [shape = circle, style = "filled", fillcolor = "#E8F5E9", color = "#388E3C", fixedsize = true, width = 1.3]
        P1 [label="1.0nフライト検索"];
        P2 [label="2.0n予約"];
        P3 [label="3.0n支払い処理"];
        P4 [label="4.0n予約管理"];
        P5 [label="5.0nレポート生成"];

        // データストア
        node [shape = record, style = "filled", fillcolor = "#FFF9C4", color = "#FBC02D", fixedsize = false]
        FlightDS [label="{ <id> D1 | フライトスケジュール }"];
        BookingDS [label="{ <id> D2 | 予約記録 }"];
        PaymentDS [label="{ <id> D3 | 支払い取引 }"];
        PassengerDS [label="{ <id> D4 | 乗客情報 }"];
    }

    // --- エッジスタイル ---
    edge [
        fontname = "Helvetica,Arial,sans-serif"
        fontsize = 9
        color = "#555555"
        arrowsize = 0.8
    ]

    // --- データフロー ---
    Passenger -> P1 [label="検索条件"];
    Passenger -> P2 [label="予約詳細"];
    Passenger -> P4 [label="キャンセル/n変更リクエスト"];
    AirlineOperator -> P5 [label="レポートリクエスト"];
    Admin -> P5 [label="分析リクエスト"];

    P1 -> Passenger [label="利用可能なnフライト"];
    P2 -> Passenger [label="予約n確認"];
    P4 -> Passenger [label="更新されたn予約ステータス"];
    P3 -> PaymentGateway [label="支払いnリクエスト"];
    PaymentGateway -> P3 [label="支払いn確認"];
    P5 -> AirlineOperator [label="運用レポート"];
    P5 -> Admin [label="分析ダッシュボード"];

    P1 -> FlightDS [label="フライトn照会"];
    P2 -> BookingDS [label="予約作成"];
    P2 -> PassengerDS [label="乗客情報n保存"];
    P3 -> PaymentDS [label="支払いn記録"];
    P4 -> BookingDS [label="予約更新"];

    FlightDS -> P1 [label="フライトnスケジュールnデータ"];
    BookingDS -> P2 [label="座席n空き状況"];
    BookingDS -> P4 [label="予約n詳細"];
    PassengerDS -> P2 [label="乗客nデータ"];
    PaymentDS -> P3 [label="支払いnステータス"];
    BookingDS -> P5 [label="予約n履歴"];
    PaymentDS -> P5 [label="収益nデータ"];

    P1 -> P2 [label="選択されたnフライト"];
    P2 -> P3 [label="支払いn詳細"];
    P3 -> P2 [label="支払いn確認"];
}