毫无疑问，统一资源标识符(uri)是基于Web的应用程序的最重要特征之一。
Universal Resource Identifiers (URIs) are, without question, one of the single most important characteristics of Web-based applications.
如果您对这些标识符以及它们可能包含的内容有疑问，请与我们联系。
If you have any questions about these tags or what they may contain, please contact us.
如果对如何将运算符用于某个特定数据库有疑问，请参见所用数据库的文档。
If you have questions about how to use operators with a particular database, refer to the documentation for the database that you are using.
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