(S (S (SBAR (IN While) (S (BASENP (NNP New) (NNP Orleans) (NNP Mayor) (NNP C.) (NNP Ray) (NNP Nagin)) (VP (VBZ has) (VP (VBN ordered) (NP (BASENP (DT a) (QT (DQL ``) (JJ forced) (DQR '')) (NN evacuation)) (PP (IN of) (BASENP (DT the) (NN city)))))))) (COMMA ,) (S (BASENP (PRP it)) (VP (VP (VP (VBZ is) (RB not)) (ADJP (JJ apparent) (ADVP (RB yet)))) (SBAR (IN whether) (S (BASENP (DT these) (NNS orders)) (VP (VBP are) (VP (VBG being) (VP (VBN executed) (PP (IN by) (BASENP (NN law) (NN enforcement) (NNS agencies))))))))))) (PERIOD .))