This is a message exchange pattern (MEP) where a single request may yield numerous response messages.
This usually implies that a broker that receives a requestor's query and spawns multiple requests to relevant entities. The broker insulates the requester from the individual sources that may be queried on the requestor's behalf.
The broker correlates responses from individual sources and sends a response back to the requestor. Some sources may produce information relevant to the query whereas others may return no results.
This is a common pattern with background check package orders that cover multiple services.
