I just started using Stanford Parser but I do not understand the tags very well. This might be a stupid question to ask but can anyone tell me what does the SBARQ and SQ tags represent and where can I find a complete list for them? I know how the Penn Treebank looks like but these are slightly different.
Sentence: What is the highest waterfall in the United States ?
(ROOT
(SBARQ
(WHNP (WP What))
(SQ (VBZ is)
(NP
(NP (DT the) (JJS highest) (NN waterfall))
(PP (IN in)
(NP (DT the) (NNP United) (NNPS States)))))
(. ?)))
I have looked at Stanford Parser website and read a few of the journals listed there but there are no explanation of the tags mentioned earlier. I found a manual describing all the dependencies used but it doesn't explain what I am looking for. Thanks!
Answer
This reference looks to have an extensive list - not sure if it is complete or not.
Specifically, it lists the ones you're asking about as:
SBARQ - Direct question introduced by a wh-word or a wh-phrase. Indirect
questions and relative clauses should be bracketed as SBAR, not SBARQ.
SQ - Inverted yes/no question, or main clause of a wh-question,
following the wh-phrase in SBARQ.