Table per Concrete Class using Implicit polymorphism.
4使用隐式多态实现每个具体类一张表。
Our third and last strategy is probably the most imaginative of all: having one table per concrete class and none for the Estate abstract superclass.
我们的第三个，也是最后一个策略可能是三个策略当中最有想象力的：每个具体类一个表，抽象超类estate没有表。
"Table per Concrete Class using implicit Polymorphism" is not recommended due to its verbose configurations, complex association syntax using "any" element and potentially dangerous implicit queries.
“使用隐式多态实现每个具体类一张表”这种做法并不推荐，因为其配置过于繁缛、使用“any”元素的复杂关联语法和隐式查询的潜在危险性。
Table per-class: (Optional) Each concrete subclass is mapped to a table and contains columns for super class attributes.
按类表：(可选)每个具体的子类映射到一个表，并且包含超类属性的列。
Table per-class: (Optional) Each concrete subclass is mapped to a table and contains columns for super class attributes.
按类表：(可选)每个具体的子类映射到一个表，并且包含超类属性的列。
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