允许将消息的各部分与策略条件名相关联，以便用于计算将哪些中介策略应用到当前消息。
Allows for the association of parts of the message with policy condition names, which is used in calculating which mediation policies apply to the current message.
为此，定义一个中介gate条件，以便自动生成策略附件文档。
To do so, define a mediation gate condition to the automatically generated policy attachment document.
这些范围点允许对中介流进行配置，将根据这些配置有条件地调用服务、端点或操作。
These scope points allow for configuration of the mediation flow based conditionally on which service, endpoint, or operation is invoked.
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