edu.nyu.jet.refres

Class CorefFilter

java.lang.Object

edu.nyu.jet.refres.CorefFilter

public class CorefFilter
extends Object

CorefFilter provides a set of static methods for converting between alternative representations of coreference information.

The standard representation of coreference used internally by Jet is a set of 'entity' Annotations, where each 'entity' annotation has a 'mentions' feature. The value of the 'mentions' feature is an array of Annotations, where each Annotation is of type 'mention' or 'constit'. The mentions in the array are coreferential.

Such a representation using Annotations pointing to other Annotations is not convenient for external (XML) representation. Two other representations are used externally, a numbered-entity representation and a linked-mention representation.

The linked-mention representation was used as the standard for MUC-6 and MUC-6. Each mention is marked by an Annotation
< COREF ID="n1" REF="n2" >
indicating that the mention with ID n2 is the antecedent of the mention with ID n1.

In the numbered-entity representation, each mention is marked by an Annotation
< mention entity=entity-ID :gt;
where mentions with the same entity-ID are coreferential.

Constructor Summary

Constructors

Constructor and Description
CorefFilter()

Method Summary

Methods

Modifier and Type	Method and Description
static void	buildEntitiesFromLinkedMentions(Document doc) buildEntitiesFromLinkedMentions takes a Document with annotations following the MUC standard (linked-mention representation) coref id=mention-ID ref=prior-mention-ID and generates the internal representation of coreference, with annotations of the form entity mentions=Vector(mentions)
static void	buildEntitiesFromMentions(Document doc) buildEntitiesFromMentions takes a Document with coreference marked in numbered-entity form, with Annotations of the form mention entity=entity-ID where coreferential entities share the same entity-ID, and generates annotations of the form entity mentions=Vector(mentions)
static void	buildLinkedMentionsFromEntities(Document doc) buildLinkedMentionsFromEntities takes a Document with coreference information in the form of mention attributes on entities and generates Annotations of the form COREF ID="n1" REF="n2" over the heads of mentions, where coreferential mentions are linked by having the same entity-ID.
static void	buildMentionsFromEntities(Document doc) buildMentionsFromEntities takes a Document with coreference information in the form of mention attributes on entities and generates Annotations of the form mention entity=entity-ID over the heads of mentions, where coreferential mentions are linked by having the same entity-ID.

Methods inherited from class java.lang.Object

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

Constructor Detail

CorefFilter

public CorefFilter()

Method Detail

buildEntitiesFromMentions

public static void buildEntitiesFromMentions(Document doc)

buildEntitiesFromMentions takes a Document with coreference marked in numbered-entity form, with Annotations of the form
mention entity=entity-ID
where coreferential entities share the same entity-ID, and generates annotations of the form
entity mentions=Vector(mentions)

buildEntitiesFromLinkedMentions

public static void buildEntitiesFromLinkedMentions(Document doc)

buildEntitiesFromLinkedMentions takes a Document with annotations following the MUC standard (linked-mention representation)
coref id=mention-ID ref=prior-mention-ID
and generates the internal representation of coreference, with annotations of the form
entity mentions=Vector(mentions)

buildMentionsFromEntities

public static void buildMentionsFromEntities(Document doc)

buildMentionsFromEntities takes a Document with coreference information in the form of mention attributes on entities and generates Annotations of the form
mention entity=entity-ID
over the heads of mentions, where coreferential mentions are linked by having the same entity-ID.

buildLinkedMentionsFromEntities

public static void buildLinkedMentionsFromEntities(Document doc)

buildLinkedMentionsFromEntities takes a Document with coreference information in the form of mention attributes on entities and generates Annotations of the form
COREF ID="n1" REF="n2"
over the heads of mentions, where coreferential mentions are linked by having the same entity-ID.