'''isAliasDeclaration/6'''

 * package_name
 * 'NIL'|'PUBLIC'|'PRIVATE'
 * 'NIL'|identifier|'ALL'
 * 'NIL'|component_category|'PACKAGE'|'FEATURE GROUP'
 * package_name|component_type_reference|feature_group_type_reference
 * line number (integer)

notes:

 * NIL is not a valid value for scope (warning message 002)