1. Micro Focus Identity Manager 4.8 Administration Guide: In the section "Managing Jobs," under "Creating a Job Definition," the "Subscriber Trigger" job type is explicitly defined. It states, "Sends a trigger document to the Subscriber channel of the selected driver. The trigger document can be used to start a custom job, such as migrating users from one context to another." (Reference: Chapter 11, Jobs, Section: Creating a Job Definition).
2. Micro Focus Identity Manager 4.8 Policies in Designer Guide: This guide explains the use of various XDS documents in policies. The document is described as a mechanism to initiate policy processing for specific, often custom, tasks. The guide notes, "A trigger document is sent to a driver to start a process." (Reference: Chapter 3, Policies for Identity Manager, Section: Understanding XML Documents).