当你运用下述地图层方法之一时; Search By Distance (通过距离搜索)搜索表达式 (Search Expression),以及 Seafch Shape (搜索形状), 一个记录集将被该方法返回, 只有满足该方法条件的记录格被包含在该记录集中.
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然后，您就可以单击 “查找内容” 框右侧的右箭头按钮以显示正则搜索表达式列表。
Then you can click the right-arrow button to the right of the Find What box to display a list of regular search expressions.
这就产生了一个我们未考虑到的情况，用户可能因为使用Google的搜索表达式而造成他们在我们的OPAC系统中没有检索结果。
This revealed a problem we had not expected: users were possibly getting zero results in our OPAC because they were using Google search syntax!
全文搜索表达式在sql上下文中表达，相关的XML文档在XQuery上下文中使用db 2 - fn： sqlquery输入函数进行处理。
The full-text search expression is expressed in an SQL context, and the relevant XML documents are processed in the XQuery context using the db2-fn: sqlquery input function.
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