Adding a function is just like adding a new class to any other project type.
添加函数就像将新类添加到任何其他项目类型一样。
A client sending the old type to a new service will still function.
发送旧类型的客户端对新服务来说仍然可用。
XMLCAST: a new SQL function that converts an XML node's value into a relational data type, such as VARCHAR, INTEGER, DATE, and so on.
XMLCAST:这个新的SQL函数将xml节点的值转换为关系数据类型,比如VARCHAR、INTEGER、DATE等等。
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