引证，引文，和定义标签。
定义过滤、标签和规则，(在gmail里)做好存档，将邮件统统清出你的收件箱。
Define filters, labels and rules, and (on Gmail) Archive anything that matches them - move as much stuff out of your Inbox as possible.
为了支持按组件去消费和生产消息，可以通过往组件定义中添加消费者和生产者标签来实现。
Support for consuming and producing messages by a component is implemented through adding consumer and producer tags to a component definition.
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