number of components
	for each component specify (for each row):
component id
number of requirement interface
list of requirement interface
number of provided interface
list of provided interface
type of component: 0-simple or 1-compound
cost
	At the end of the file specify the final system (or compound component) to be constructed, specifying:
        level number
	0-for final system or id of the compound component
	number of requirement interface
	list of requirement interface
	number of provided interface
	list of provided interface

