'''isProperty/9'''

 * 'NIL'|'CONSTANT'
 * '=>'|'+=>'|'APPLIES TO'
 * 'NIL'|package_name
 * 'NIL'|component_type_identifier
 * 'NIL'|component_implementation_identifier
 * property_owner_identifier
 * (property) identifier
 * (property) assignment
 * line number (integer)

notes:

 * package_name is mandatory for AADL v2 (warning message 001)