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+digraph ReservationSystemDiagram {
+    graph [
+        rankdir=TB,
+        splines=ortho,
+        label="Lodge Reservation System",
+        fontsize=20
+    ];
+
+    node [
+        shape=record,
+        style=filled,
+        fillcolor=lightyellow,
+        fontname="Helvetica"
+    ];
+
+    edge [
+        penwidth=1.0,
+        fontname="Helvetica"
+    ];
+
+    // Class Definitions
+
+    AccomodationManager [label="{AccomodationManager|- accounts: AccountList\l|+ setDataStoreRoot(home: String): void\l+ loadAll(): void\l+ retrieveLoadedAccounts(): List<Account>\l+ retrieveAccount(acct_id: String): Account\l+ AddAccount(acct: Account): void\l+ UpdateAccount(acct: Account): void\l+ newAccount(...): Account\l+ addReservation(account: Account, reservation: Reservation): boolean\l+ findReservation(reservation_number: String): Reservation\l}"];
+
+    AccountList [label="{AccountList|# extends ArrayList<Account>\l+ add(account: Account): boolean\l+ save(acct: Account): void\l+ find(account_number: String): Account\l}"];
+
+ 
+    HotelReservation [label="{HotelReservation|+ ReservationType(): String\l+ calculatePrice(): float\l+ getPricePerNight(): float\l}"];
+    HouseReservation [label="{HouseReservation|+ ReservationType(): String\l+ calculatePrice(): float\l+ getPricePerNight(): float\l}"];
+    CabinReservation [label="{CabinReservation|+ ReservationType(): String\l+ calculatePrice(): float\l+ getPricePerNight(): float\l}"];
+
+    DataRepository [label="{DataRepository|- directoryPath: String\l- instance: DataRepository\l+ {static} setDataStoreRoot(path: String): void\l+ {static} getPath(): String\l+ {static} LoadAccount(file: Path): Account\l+ {static} WalkFileSystemTree(...): void\l}"];
+
+    // Data model classes (simplified)
+    subgraph cluster_datamodel {
+        label = "Data Models";
+        style = "dashed";
+ 
+        Address [label="{Address|- street: String\l- city: String\l- state: String\l- zip: String\l}"];
+ 
+        EmailAddress [label="{EmailAddress|- email: String\l}"];
+
+           Account [label="{Account|- account_number: String\l- phone_number: String\l- mailing_address: Address\l- email_address: EmailAddress\l- reservations: AccountReservationList\l|+ add(rsrv: Reservation): boolean\l+ Write(acct: Account): void\l+ findReservation(reservation_number: String): Reservation\l+ checkValid(): boolean\l}"];
+
+    AccountReservationList [label="{AccountReservationList|# extends ArrayList<IReservation>\l+ add(reservation: IReservation): boolean\l+ find(reservation_number: String): Reservation\l}"];
+
+    IReservation [label="{<<interface>>\nIReservation|+ getReservation_number(): String\l+ getAccountNumber(): String\l+ calculatePrice(): float\l+ checkValid(): boolean\l+ ReservationType(): String\l}"];
+
+    Reservation [label="{<<abstract>>\nReservation|- reservation_number: String\l- physical_address: Address\l- reservation_start_date: ZonedDateTime\l- reservation_end_date: ZonedDateTime\l- reservation_status: ReservationStatusEnum\l- price: Float\l# accountNumber: String\l|+ Change(reservation: Reservation, newStatus: ReservationStatusEnum): void\l+ ReservationType(): String\l}"];
+
+    }
+
+    // Relationships
+
+    // Composition / Aggregation
+    AccomodationManager -> AccountList [
+        arrowhead=odiamond,
+        label="manages",
+        taillabel="1",
+        headlabel="1"
+    ];
+
+    AccountList -> Account [
+        arrowhead=odiamond,
+        label="contains",
+        taillabel="1",
+        headlabel="0..*"
+    ];
+
+    Account -> AccountReservationList [
+        arrowhead=odiamond,
+        label="has",
+        taillabel="1",
+        headlabel="1"
+    ];
+
+    AccountReservationList -> IReservation [
+        arrowhead=odiamond,
+        label="contains",
+        taillabel="1",
+        headlabel="0..*"
+    ];
+
+    // Inheritance / Implementation
+    Reservation -> IReservation [arrowhead=onormal, style=dashed, label="implements"];
+    HotelReservation -> Reservation [arrowhead=empty, label="extends"];
+    HouseReservation -> Reservation [arrowhead=empty, label="extends"];
+    CabinReservation -> Reservation [arrowhead=empty, label="extends"];
+
+    // Association / Dependency
+    AccomodationManager -> DataRepository [arrowhead=vee, style=dashed, label="uses"];
+    Account -> Address [
+        arrowhead=vee, style=dashed,
+        label="has a mailing address",
+        taillabel="*",
+        headlabel="1"
+    ];
+    Account -> EmailAddress [
+        arrowhead=vee, style=dashed,
+        label="has an email",
+        taillabel="*",
+        headlabel="1"
+    ];
+    Reservation -> Address [arrowhead=vee, style=dashed, label="has physical & mailing addresses"];
+}