checks if a real subsystem can be built from the configurationData: all objects in the
component node are built but the subsystem at the top is not started.
A subsystem that listens on the buses for request for boot data, or for other subsystems
status notifications fired when they start with a configuration (or give up);
it is also a full-fledged Configuration service that can receive and execute commands.
Default filter for parameters: gets rid of all parameters that are references to other components
and considers that a parameter with name "name" is out.
Filters a parameter: given its name and or a value accept or reject it to be included
in a list of ParameterDescription (that is a list of Parameter open for modifications).