Constituent tree
From OpenCog
The Link Grammar parser can generate a Penn tree-bank style phrase structure. For example:
(S (NP The commie) (VP was (ADJP red)) .)
The phrase structure as output by RelEx is identical to that output by the link grammar parser; RelEx does not modify it. RelEx does use the phrase structure in various ways, including the Hobbs algorithm anaphora resolution algorithm.
There are a number of different possible phrase types:
| Description | Penn type | Example |
|---|---|---|
| adjective phrase | ADJP | |
| adverb phrase | ADVP | |
| sentence clause | S | (S (NP (NP The commie) , (SBAR (WHNP who) (S (VP was (ADJP red)))) ,) (VP faded (PRT away)) .) |
| inverted subject-verb clause | SINV | |
| noun phrase | NP | |
| particle | PRT | (S (NP (NP The commie) , (SBAR (WHNP who) (S (VP was (ADJP red)))) ,) (VP faded (PRT away)) .) |
| prepositional phrase | PP | (S (NP There) (VP were (NP (NP three) (PP of (NP them)))) .) |
| quantifier phrase | QP | |
| root clause | S | |
| subordinate clause | SBAR | (S (NP (NP The commie) , (SBAR (WHNP who) (S (VP was (ADJP red)))) ,) (VP faded (PRT away)) .) |
| verb phrase | VP | |
| wh-adverb | WHADVP | (S (NP The bridge) (VP was (ADJP unfinished)) (SBAR (WHADVP when) (S (NP it) (VP collapsed))) .) |
| wh-noun | WHNP | (S (NP (NP The commie) , (SBAR (WHNP who) (S (VP was (ADJP red)))) ,) (VP faded (PRT away)) .) |
| wh-prep | WHPP | (S (NP The commie (SBAR (WHPP to (WHNP whom)) (S (NP I) (VP was))) speaking) (VP was (ADJP red)) .) |
