The datasource attribute identitifies the database where the query gets the data.
datasource 属性确认了该查询从中获得数据的数据库。
The query maps one or more specific XML element or attribute node values to an equal number of relational data type columns (see Figure 6).
查询将一个或多个特定XML元素或属性节点值映射到同等数量的关系数据列(参见图6)。
In order to realize the dynamic renewal and various query of the earth nature data, the technology of GIS is used to realize the exchange visits between the attribute data and space data.
实现了土地属性数据的动态更新和各种查询，通过GIS技术实现属性数据与空间数据互访。
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