'''isCompImpComment/6'''

 * 'NIL'|package_name
 * 'NIL'|'PUBLIC'|'PRIVATE'
 * component_type_identifier
 * (component implementation) identifier
 * comment
 * line number

notes:

 * package_name is mandatory for AADL v2 (warning message 001)
 * NIL is not a valid value for scope (warning message 002)