Mappings Between SMN Actions and APIs

**Table 1** Mappings between SMN actions and APIs
Action	API	Function
SMN:UpdateTopic	UpdateTopic	Modify the topic. Only the display_name value can be changed.
SMN:DeleteTopic	DeleteTopic	Delete a topic and its subscribers. If a topic is deleted, any pending messages may fail to send to the topic subscribers.
SMN:QueryTopicDetail	QueryTopicDetail	Query details about a topic.
SMN:ListTopicAttributes	ListTopicAttributes	Query topic attributes.
SMN:UpdateTopicAttribute	UpdateTopicAttribute	Modify an attribute of a topic.
SMN:DeleteTopicAttributes	DeleteTopicAttributes	Delete all attributes of a topic.
SMN:DeleteTopicAttributeByName	DeleteTopicAttributeByName	Delete an attribute of a specified topic.
SMN:ListSubscriptionsByTopic	ListSubscriptionsByTopic	Query the subscription list of a specified topic by page. The list is sorted by time when the subscriptions are added in ascending order. You can specify values of offset and limit. If no subscription has been added, an empty list is returned.
SMN:Subscribe	Subscribe	Add a subscription to a specified topic and send a confirmation message to the subscriber. After confirming the subscription, the subscriber can receive notification messages published to the topic.
SMN:Unsubscribe	Unsubscribe	Delete a subscription. This operation requires identity authentication. Only the subscriber or the topic owner can delete a subscription.
SMN:Publish	Publish	Publish messages to a topic. After a message ID is returned, the message has been saved and is to be delivered to subscribers of the topic. The message form varies depending on the protocol of each subscription.