利用本系统用户可以上传有用的复用资源，同时可以多条件组合查询可复用库中的资源从而实现精确定位资源，达到快速查找的功能。
By using the system users can upload some useful resources and inquire the resource in the storehouse by mult-conditions combination for getting the resources accurately and quickly.
清单 15 中惟一 麻烦的条件就是第一条，它要验证消息是一个定义查询而不是其他可能的组合，如 is...
The only vexing conditional in Listing 15 happens to be the first one, which attempts to verify if the message is truly a definition query and not one of the other possible combinations such as is...
我们如何处理需要组合各种条件集合的查询呢？
How can we handle queries that need to group various sets of criteria? For example, suppose I want to find all employees where?
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