NB. The root object
NB. This object has no data structure and
NB. implements only the type method.

root_object_z_ =. monad def 0
('method' ; 'value') =. 2 take y.
if. method -: 'type'
  do. 'root object'
  else. 'In root object: ',method,': Invalid method name.'
end.
)