EDOC — FCM/Motivation: Why use FCMCommand?

Section 6.2.1: the Motivation should state why FCMCommand has been chosen as the primary 'composite node' element from FCM (as opposed to FCMComponent for example which seems a more obvious match). According to EDOC "An FCMCommand is a special kind of FCMNode that represents the invocation of a particular FCMOperation on an FCMComponent. An FCMCommand can be thought of as being analogous to a programming language statement that invokes a method on an object".