如果这些请求数据在该请求消息的SOAP消息头部分中传送，那么用户就可以调用这个显式消息头。
If some of the request data is transferred in the SOAP header part of the request message, you can call this an explicit header.
但是对于查询，数据库服务器直到查询实际运行时(也就是说，直到用户显式请求结果集时)才能建立查询计划。
For a query, however, a database server cannot establish a query plan until the query is actually run - that is, until the user explicitly demands the result set.
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