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:

Stanford uses type dependencies to describe the grammatical relationships that exist within a sentence. These are detailed in the Stanford typed dependencies manual (http://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.

In this case, the TreePrint object is created, showing "typedDependenciesCollapsed":

TreePrint treePrint =  
    new TreePrint("typedDependenciesCollapsed"); 
treePrint.printTree(parseTree); 

The output of this sequence is as follows, where the number reflects its position within the sentence:

det(cow-2, The-1)
nsubj(jumped-3, cow-2)
root(ROOT-0, jumped-3)
det(moon-6, the-5)
prep_over(jumped-3, moon-6)  

Using the penn string to create the object results in the following output:

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

The dependencies string produces a simple list of dependencies:

    dep(cow-2,The-1)
    dep(jumped-3,cow-2)
    dep(null-0,jumped-3,root)
    dep(jumped-3,over-4)
    dep(moon-6,the-5)
    dep(over-4,moon-6)
  

The formats can be combined using commas. The following example will result in both the penn style and the typedDependenciesCollapsed formats being used for the display:

    "penn,typedDependenciesCollapsed"