データフロー図の習得：手描きからビジュアルパラダイムによる AI 支援モデリングへ

digraph DFD {
    // --- グラフスタイルと図のタイトル ---
    graph [
        rankdir = LR
        splines = true
        overlap = false
        nodesep = 0.5
        ranksep = 0.8
        fontname = "Helvetica,Arial,sans-serif"
        fontsize = 12
        label = "オンライン注文処理システム"
    ]

    // --- 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"]
    Customer; PaymentGateway; Warehouse; Courier;

    // --- システム境界コンテナ ---
    subgraph cluster_SystemBoundary {
        label = "オンライン注文処理システム";
        fontname = "Helvetica,Arial,sans-serif"
        fontsize = 14
        color = "#757575"
        style = "dashed,rounded"
        bgcolor = "#FAFAFA"
        margin = 20

        // プロセス
        node [shape = circle, style = "filled", fillcolor = "#E8F5E9", color = "#388E3C", fixedsize = true, width = 1.3]
        P1 [label="1.0n注文n入力"];
        P2 [label="2.0n支払いn処理"];
        P3 [label="3.0n在庫n確認"];
        P4 [label="4.0n注文n発送"];

        // データストア
        node [shape = record, style = "filled", fillcolor = "#FFF9C4", color = "#FBC02D", fixedsize = false]
        OrderDS [label="{ <id> D1 | 注文 }"];
        ProductDS [label="{ <id> D2 | 商品n在庫 }"];
        ShippingDS [label="{ <id> D3 | 配送 }"];
    }

    // --- 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 ---
    Customer -> P1 [label="注文 &nアカウント詳細"];
    P1 -> Customer [label="注文n確認"];
    P2 -> PaymentGateway [label="支払いnリクエスト"];
    PaymentGateway -> P2 [label="支払いnステータス"];
    P1 -> P2 [label="注文n合計"];
    P2 -> P3 [label="支払い済みn注文"];
    P3 -> P4 [label="確認済みn注文"];
    P1 -> OrderDS [label="注文n作成"];
    P3 -> ProductDS [label="在庫n更新", dir=both];
    P4 -> ShippingDS [label="配送n作成"];
    OrderDS -> P3 [label="注文n詳細"];
    ShippingDS -> P4 [label="配送nラベル"];
    Warehouse -> P3 [label="在庫n利用可能"];
    Courier -> P4 [label="配送nステータス", dir=both];
}

digraph DFD {
graph [
rankdir = LR
splines = true
overlap = false
nodesep = 0.5
ranksep = 0.8
fontname = "Helvetica,Arial,sans-serif"
fontsize = 12
label = "在庫確認（レベル 2）- オンライン注文処理システム"
]
node [
fontname = "Helvetica,Arial,sans-serif"
fontsize = 11
penwidth = 1.5
]
node [shape = box, style = "filled", fillcolor = "#E1F5FE", color = "#0288D1"]
Warehouse;
subgraph cluster_SystemBoundary {
label = "3.0 在庫確認";
fontname = "Helvetica,Arial,sans-serif"
fontsize = 14
color = "#757575"
style = "dashed,rounded"
bgcolor = "#FAFAFA"
margin = 20
node [shape = circle, style = "filled", fillcolor = "#E8F5E9", color = "#388E3C", fixedsize = true, width = 1.3]
P31 [label="3.1n商品n利用可能確認"];
P32 [label="3.2n在庫n確保"];
P33 [label="3.3n顧客n通知"];
node [shape = record, style = "filled", fillcolor = "#FFF9C4", color = "#FBC02D", fixedsize = false]
ProductDS [label="{ <id> D1 | 商品n在庫 }"];
OrderDS [label="{ <id> D2 | 注文 }"];
ReservationDS [label="{ <id> D3 | 在庫n予約 }"];
node [shape = circle, style = "filled", fillcolor = "#FCE4EC", color = "#C2185B", fixedsize = true, width = 1.3]
P2 [label="2.0n支払いn処理n（親）"];
P4 [label="4.0n注文n発送n（親）"];
}
edge [
fontname = "Helvetica,Arial,sans-serif"
fontsize = 9
color = "#555555"
arrowsize = 0.8
]
P2 -> P31 [label="支払い済みn注文"];
P31 -> P32 [label="利用可能n商品"];
P32 -> P33 [label="在庫n確保済み"];
P33 -> P4 [label="確認済みn注文"];
P31 -> OrderDS [label="注文n項目の読み取り"];
P31 -> ProductDS [label="在庫n確認", dir=both];
P32 -> ProductDS [label="在庫n減算"];
P32 -> ReservationDS [label="予約n作成"];
P33 -> OrderDS [label="ステータスn更新", dir=both];
Warehouse -> P31 [label="在庫n利用可能"];
Warehouse -> P32 [label="再入荷nアラート"];
}