Say I have the following Penn Tree:
(S (NP-SBJ the steel strike)
(VP lasted
(ADVP-TMP (ADVP much longer)
(SBAR than
(S (NP-SBJ he)
(VP anticipated
(SBAR *?*))))))
.)
What do abbrevations like VP
and SBAR
etc mean? Where can I find these definitions? What are these abbreviations called?