To draw a guard on a sequence diagram in UML 1.x, you placed the guard element above the message line being guarded and in front of the message name.
UML 1. x中，为了在一个序列图上画一个约束，你把约束元件放在约束的消息线上，消息名字之前。
To draw a guard on a sequence diagram in UML 1.x, you placed the guard element above the message line being guarded and in front of the message name.
UML 1. x中，为了在一个序列图上画一个约束，你把约束元件放在约束的消息线上，消息名字之前。
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