'''isInternalFeature/7'''

 * 'NIL'|package_name
 * component_type_identifier
 * component_implementation_identifier
 * (feature) identifier
 * 'EVENT'|'EVENT DATA'|'PORT'|'SUBPROGRAM'
 * 'NIL'|component_classifier_reference
 * line number (integer)

notes:

 * new in AADL 2.2