Optional
_endpointOptional
_nameName of system
Actual destination address or id
Optional
extensionAdditional content defined by implementations
Optional
idUnique id for inter-element referencing
Optional
modifierExtensions that cannot be ignored even if unrecognized
Optional
nameName of system
Optional
receiverIntended "real-world" recipient for the data
Optional
targetParticular delivery destination within the destination
Actual destination address or id