矢量数据指的是通过几何结构定义的数据，如线段表示街道，而点表示位置。
Vector data refers to data defined by geometric constructs, such as line segments representing a street or points representing single locations.
对于DB 2索引扩展要注意的一点是对用户定义类型的需求—distinct类型或结构化类型。
One thing to be aware of regarding DB2 index extensions is the requirement for user-defined types - either distinct types or structured types.
该方法充分利用页面路径包含的网站层次结构所体现的分类信息，将同一目录中的页面定义为一个兴趣点。
The method defines all the pages in the same content of page hierarchy as an interest point, and extracts interest points in a session.
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