The entity (person or organization) that wishes to make use of a provider’s Web service. It will use a requester agent to exchange messages with the provider’s provider agent. “Requester” is also used as a shorthand to refer to the requester agent acting on the requester’s behalf.
Sources:
NIST SP 800-95
from
Web Services Architecture - W3C Working Group Note 11 February 2004
Generally an individual, process, or device causing information to flow among objects or change to the system state. See object.
Sources:
CNSSI 4009-2015
under subject
An individual, process, or device that causes information to flow among objects or change to the system state. Also see object.
Sources:
NIST SP 800-53 Rev. 5
under subject
NIST SP 800-53A Rev. 5
under subject
The entity requesting to perform an operation upon the object.
Sources:
NIST SP 800-162
under subject