使用xml映射不需要超类，只需将EntityName参数提供给两个相同的映射即可。
映射示例：
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="DomainModel.User, DomainModel"
table="User1Object" entity-name="User1Object">
<id name="_id" access="field" column="id">
<generator class="assigned"/>
</id>
<property name= ...>
</class>
<class name="DomainModel.User, DomainModel"
table="User2Object" entity-name="User2Object">
<id name="_id" access="field" column="id">
<generator class="assigned"/>
</id>
<property name= ...>
</class>
</hibernate-mapping>
_session.Save("User1Object", user1)
要么
_session.Save("User2Object", user2)
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