The CaveatEmptor application name : String name : (My space web page)
The CaveatEmptor application name : String name : String description : String initialPrice : BigDecimal reservePrice : BigDecimal startDate : Date endDate : Date state : ItemState approvalDatetime : Date firstname : String lastname : String username : String password : String email : String ranking : int admin : boolean sold by bought 0..* 0..* 1..* amount : BigDecimal created : Date 0..* successful 0..* ownername : String BillingDetails type : CreditCardType number : String expMonth : String expYear : String number : String bankname : String swift : String default 0..* rating : Rating text : String created : Date from about street : String zipcode : String city : String home billing 0..* children parent shipping delivery inspectionPeriodDays : int state : ShipmentState created : Date seller buyer 0..1 0..1 Figure 3.2 Persistent classes of the CaveatEmptor domain model and their relationships many BillingDetails. The various billing strategies are represented as subclasses of an abstract class (allowing future extension). A Category may be nested inside another Category. This is expressed by a recursive association, from the Category entity to itself. Note that a single Category may have multiple child categories but at most one parent. Each Item belongs to at least one Category. The entities in a domain model should encapsulate state and behavior. For example, the User entity should define the name and address of a customer and the logic required to calculate the shipping costs for items (to this particular customer). The domain model is a rich object model, with complex associations, interactions, and inheritance relationships. An interesting and detailed discussion of object-oriented techniques for working with domain models can be found in Patterns of Enterprise Application Architecture (Fowler, 2003) or in Domain-Driven Design (Evans, 2003).
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