Effective data source selection strategy is one of the important issues of the spatial information retrieval.
合理高效的数据源选择策略是提高空间信息检索系统效率的重要因素之一。
The next step is to create a form definition based on this user defined metadata source, to configure the fields as selection, and to link them to the two Web services that provide the data.
下一步是生成基于用户定义的元数据源的表单定义，配置作为选项的字段，并将其链接到提供数据的两个 Web 服务。
Random: A mostly random selection of hosts from the data source.
随机：大多是从数据源中选择一个随机的主机。
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