首先，选择性的RSS叠加层可以让用户将网站活动同重要RSS源匹配起来。
First, there's a selective RSS overlay to let you match site activity with key feeds.
对于没有数据的副本(Virtual Documents活动监视的数据库)，删除选择性复制公式，从而可以复制数据文档。
For the replica without data (the one that is being watched by the Virtual documents activity), remove the selective replication formula, so that your data documents can replicate.
如对业务流程中活动所做的处理一样，在业务模型中，也可以将业务用例确定为的核心的、可选的，或选择性的。
As was done with activities in the business Process, business Use Cases can also be identified as being kernel, optional, or alternative within the business model.
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