as invested with its dignity,  since the seventeenth century just as the Crown has been used for the monarch, or the Oval Office has come to stand for the President of the United States.
( ( as ( invested ( with ( its dignity ) ) ) ) ( , ( ( since ( ( ( ( ( ( the ( seventeenth century ) ) ( just ( as ( the Crown ) ) ) ) ( has ( been ( used ( for ( the monarch ) ) ) ) ) ) , ) or ) ( ( the ( Oval Office ) ) ( has ( come ( to ( stand ( for ( ( the President ) ( of ( the ( United States ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (FRAG (ADJP (RB as) (VBN invested) (PP (IN with) (NP (PRP$ its) (NN dignity)))) (, ,) (SBAR (IN since) (S (S (NP (NP (DT the) (JJ seventeenth) (NN century)) (PP (RB just) (IN as) (NP (DT the) (NNP Crown)))) (VP (VBZ has) (VP (VBN been) (VP (VBN used) (PP (IN for) (NP (DT the) (NN monarch))))))) (, ,) (CC or) (S (NP (DT the) (NNP Oval) (NNP Office)) (VP (VBZ has) (VP (VBN come) (S (VP (TO to) (VP (VB stand) (PP (IN for) (NP (NP (DT the) (NNP President)) (PP (IN of) (NP (DT the) (NNP United) (NNPS States))))))))))))) (. .)))
The oval office represents the President of the United States.
( ( The ( oval office ) ) ( ( represents ( ( the President ) ( of ( the ( United States ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ oval) (NN office)) (VP (VBZ represents) (NP (NP (DT the) (NNP President)) (PP (IN of) (NP (DT the) (NNP United) (NNPS States))))) (. .)))