下一版本应该把重点放在服务接口，而不是数据访问和业务逻辑层。
The next version should focus less on the data access and business logic tiers and more on the service interface.
许多用户都用自己的数据访问层，使用自己的API编写业务逻辑。
Many users have their own data access layer, with their own APIs, to which the business logic is coded.
应用定制：在UI、业务逻辑和数据访问层，针对租户的元数据驱动的应用扩展。
Application customization: metadata driven application for tenant extensions at the UI, business logic and data access layers.
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