Method, device and system for subscribing and publishing digital objects in data space

The invention provides a method, a device and a system for subscribing and publishing digital objects in a data space, and belongs to the technical field of data spaces. The method comprises the steps that a newly published event of any main body is monitored, the newly published event is digital object metadata newly published by the main body or a mapping result of changed digital object metadata, and the newly published event comprises one or more event attributes; when it is monitored that a newly published event is published, a target subscription matched with the newly published event is determined according to the event attribute of the newly published event and the node attribute of a pre-constructed subscription tree, and the subscription represents the requirement of a corresponding subject for digital object metadata; each node in the subscription tree is used for storing subscriptions, and the node attributes of all the nodes in the subscription tree and the paths between the nodes of different le