Using Parser to Extract Relationships - Natural Language Processing with Java - page 259

parseTree.pennPrint();

The output is as follows:

(ROOT
(S

(NP (DT The) (NN cow))
(VP (VBD jumped)
(PP (IN over)
(NP (DT the) (NN moon))))
(. .)))

The Tree class provides numerous methods for working with parse trees.

Using the TreePrint class

The TreePrint class provides a simple way to display the tree. An instance of the class
is created using a string describing the display format to be used. An array of valid output
formats can be obtained using the static outputTreeFormats variable and are listed
in the following table:

Tree Format Strings

penn dependencies collocations

oneline typedDependencies semanticGraph

rootSymbolOnly typedDependenciesCollapsed conllStyleDependencies

words latexTree conll2007

wordsAndTags xmlTree

Stanford uses type dependencies to describe the grammatical relationships that exist with-
in a sentence. These are detailed in the Stanford Typed Dependencies Manual ( ht-
tp://nlp.stanford.edu/software/dependencies_manual.pdf ) .

The following code example illustrates how the TreePrint class can be used. The
printTree method performs the actual display operation.