Index extensions (user-defined structured type related).
索引扩展(与用户定义的结构化类型相关)。
A structured data type is a form of user-defined data type that contains a sequence of attributes, each of which has a data type.
结构化数据类型是一种用户定义的数据类型，它包含了一系列的属性，每一个属性都有一个数据类型。
A typed table is a table that is defined with a user-defined structured type.
类型化表是一个使用用户定义的结构化类型定义的表。
A typed table is a table that is defined with a user-defined structured type.
类型化表是一个使用用户定义的结构化类型定义的表。
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