Hello all! My mean problem is that I dont know how to extract nodes from GrammaticalStructure. I am using englishPCFG.ser in java netbeans. My target is o know the quality of the screen like:

the screen of iphone 4 is great.

I want to extract screen and great. how can i extract the NN (screen) and VP (great)

the code that I wrote is:

LexicalizedParser lp = new LexicalizedParser("C:\\englishPCFG.ser");
lp.setOptionFlags(new String[]{"-maxLength", "80", "-retainTmpSubcategories"});

String sent ="the screen is very good.";
Tree parse = (Tree) lp.apply(Arrays.asList(sent));

parse.pennPrint(); System.out.println();

TreebankLanguagePack tlp = new PennTreebankLanguagePack();
GrammaticalStructureFactory gsf = tlp.grammaticalStructureFactory();
GrammaticalStructure gs = gsf.newGrammaticalStructure(parse);
Collection tdl = gs.typedDependenciesCollapsed();