2、領域模型

Domain Model

An object model of the domain that incorporates both behavior and data.

For a full description see P of EAA page 116

At its worst business logic can be very complex. Rules and
logic describe many different cases and slants of behavior, and it's
this complexity that objects were designed to work with. A Domain
Model creates a web of interconnected objects, where each object
represents some meaningful individual, whether as large as a
corporation or as small as a single line on an order form.

領域模型

合并了行為和資料的領域物件模型

    在最糟的情況下，商務邏輯可能非常的複雜。規則和邏輯描述了行為上許多不同的條件和變化，而對象就是被設計用來解決的這些複雜性的。領域模型建立了一個互相互動對象組成的網，這裡每個對象都扮演某個有意義的個體， 這些對象大可以到一個公司，小可以到訂單中的一行。