最后，值得注意的是，您可以专门创建xml索引来加快对存储在xml列中的数据的访问速度。

It's worth noting that you can create specialized XML indexes to speed access to data stored in XML columns.

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数据访问对象(Data Access Object, DAO)及会话外观(Session Facade)都是非常值得一用的。

Data Access Object (DAO) and Session Facade are both good ones to use.

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但是，有一点值得注意，假如这种新格式的规范是公开的，或者您拥有访问它的权限，那么将一种虚拟设备移植到另一种格式通常是可行的。

It is worth noting, however, that it is often possible to port a virtual appliance to another format, provided that the specification of the new format is open or that you have access to it.

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