'''isCallSequence/5'''

 * 'NIL'|package_name
 * component_type_identifier
 * component_implementation_identifier
 * (call sequence) identifier
 * line number (integer)

notes:

 * package_name is mandatory for AADL v2 (warning message 001)
 * call sequence identifier is mandatory for AADL v2 (warning message 006)