这包括关于建立到数据源的连接的信息、远程服务器属性、数据类型和函数映射、索引信息以及远程对象统计信息。
This includes information about establishing connections to the data source, remote server attributes, data type and function mappings, index information, and remote object statistics.
类：用户定义的类型。一个类的声明建立了一个新的类的对象。
A programmer-defined type. A class definition creates a new class object.
首先，拟定了SDM3所支持的UDT分为列类型和行类型两种形式，能建立包含列类型的关系表和基于行类型的对象表。
The UDT introduced into SDM3 is divided into column type and row type. We can define relational table including column type and object table based on row type structure.
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