As mentioned earlier, to make it easy to follow along, the sample scenario described in this article USES the policy table that comes with the IBM Mashup Center sample database.
如前所述，为了便于学习，本文中的场景示例使用的是IBMMashupCenter示例数据库附带的策略表。
To minimize setup and make it easy to follow along, the sample scenario uses the policy table that comes with the Apache Derby sample database installed with the IBM Mashup Center.
为了简化安装过程，易于学习，场景示例将使用安装在IBMMashup Center 中的ApacheDerby 示例数据库的策略表。
For example, specifying PRIMARY KEY (id, BUSINESS_TIME WITHOUT OVERLAPS) in the policy table would ensure that two versions of the same policy that are valid at the same time cannot exist.
例如，在策略表中指定PRIMARYKEY (id, BUSINESS_TIMEWITHOUTOVERLAPS)，可以确保相同策略的同时有效的两个版本无法共存。
For example, specifying PRIMARY KEY (id, BUSINESS_TIME WITHOUT OVERLAPS) in the policy table would ensure that two versions of the same policy that are valid at the same time cannot exist.
例如，在策略表中指定PRIMARYKEY (id, BUSINESS_TIMEWITHOUTOVERLAPS)，可以确保相同策略的同时有效的两个版本无法共存。
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