每当尝试查询一个空间列时，DB 2加入一个转换，该转换将内部的、结构化类型的表示转换为应用程序能理解的表示。
Whenever you try to query a spatial column, DB2 injects a transformation from the internal, structured type representation to a representation that can be understood by the application.
除了实现SPARQL之外，ARQ的查询引擎还可以解析使用RDQL或者它自己内部的查询语言表示的查询。
In addition to implementing SPARQL, ARQ's query engine can also parse queries expressed in RDQL or its own internal query language.
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