Java Reference
In-Depth Information
Understanding parse trees
Parse trees represent hierarchical relationships between elements of text. For example, a
dependency tree shows the relationship between the grammatical elements of a sentence.
Let's reconsider the following sentence:
The cow jumped over the moon.
A parse tree for the sentence is shown here. It was generated using the techniques found in
Using the LexicalizedParser class
later in this chapter:
(ROOT
(S
(NP (DT The) (NN cow))
(VP (VBD jumped)
(PP (IN over)
(NP (DT the) (NN moon))))
(. .)))
The sentence can be graphically depicted as shown in the following figure. It was gener-
ated using the application found at
http://nlpviz.bpodgursky.com/home
. Another editor that
allows you to examine text in a graphical manner is GrammarScope (
ht-
tp://grammarscope.sourceforge.net/
). This is a Stanford supported tool that uses a Swing-
based GUI to generate a parse tree, a grammatical structure, typed dependencies, and a se-
mantic graph of text.
