edu.stanford.nlp.trees.international.arabic

Class ArabicHeadFinder

java.lang.Object

edu.stanford.nlp.trees.AbstractCollinsHeadFinder

edu.stanford.nlp.trees.international.arabic.ArabicHeadFinder

All Implemented Interfaces:

CopulaHeadFinder, HeadFinder, java.io.Serializable

public class ArabicHeadFinder
extends AbstractCollinsHeadFinder

Find the head of an Arabic tree, using the usual kind of heuristic head finding rules.

Implementation notes. TO DO: make sure that -PRD marked elements are always chosen as heads. (Has this now been successfully done or not??)

Mona: I added the 8 new Nonterm for the merged DT with its following category as a rule the DT nonterm is right headed, the 8 new nonterm DTs are: DTCD, DTRB, DTRP, DTJJ, DTNN, DTNNS, DTNNP, DTNNPS. This was added Dec 7th, 2004.

Author:

Roger Levy, Mona Diab, Christopher Manning (added new stuff for ATBp3v3

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ArabicHeadFinder.TagSet

Field Summary

Fields

Modifier and Type	Field and Description
protected ArabicHeadFinder.TagSet	tagSet

Fields inherited from class edu.stanford.nlp.trees.AbstractCollinsHeadFinder

defaultLeftRule, defaultRightRule, defaultRule, nonTerminalInfo, tlp

Constructor Summary

Constructors

Modifier	Constructor and Description
	ArabicHeadFinder()
	ArabicHeadFinder(ArabicHeadFinder.TagSet tagSet)
	ArabicHeadFinder(java.lang.String tagSet) Construct an ArabicHeadFinder with a String parameter corresponding to the tagset in use.
	ArabicHeadFinder(TreebankLanguagePack tlp)
protected	ArabicHeadFinder(TreebankLanguagePack tlp, ArabicHeadFinder.TagSet tagSet)

Method Summary

Modifier and Type	Method and Description
protected Tree	findMarkedHead(Tree t) Predicatively marked elements in a sentence should be noted as heads

Methods inherited from class edu.stanford.nlp.trees.AbstractCollinsHeadFinder

determineHead, determineHead, determineNonTrivialHead, makesCopulaHead, postOperationFix, traverseLocate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tagSet

protected ArabicHeadFinder.TagSet tagSet

Constructor Detail

ArabicHeadFinder

public ArabicHeadFinder()

ArabicHeadFinder

public ArabicHeadFinder(java.lang.String tagSet)

Construct an ArabicHeadFinder with a String parameter corresponding to the tagset in use.

Parameters:

tagSet - Either "ORIGINAL" or "BIES_COLLAPSED"

ArabicHeadFinder

public ArabicHeadFinder(ArabicHeadFinder.TagSet tagSet)

ArabicHeadFinder

public ArabicHeadFinder(TreebankLanguagePack tlp)

ArabicHeadFinder

protected ArabicHeadFinder(TreebankLanguagePack tlp,
                           ArabicHeadFinder.TagSet tagSet)

Method Detail

findMarkedHead

protected Tree findMarkedHead(Tree t)

Predicatively marked elements in a sentence should be noted as heads

Overrides:

findMarkedHead in class AbstractCollinsHeadFinder

Parameters:

t - a tree to find the head of

Returns:

the marked head-- null if no marked head