( ( Classification ( of domain ) ) . )
(ROOT (NP (NP (NN Classification)) (PP (IN of) (NP (NN domain))) (. .)))
Classification of domain.
(ROOT (S (NP (DT A) (NN domain)) (VP (VBZ is) (NP (NP (DT the) (JJS highest) (NN taxon)) (PP (IN in) (NP (NP (DT the) (NN classification)) (PP (IN of) (NP (VBG living) (NNS things))))))) (. .)))