edu.stanford.nlp.naturalli

Enum NaturalLogicRelation

java.lang.Object

java.lang.Enum<NaturalLogicRelation>

edu.stanford.nlp.naturalli.NaturalLogicRelation

All Implemented Interfaces:

Serializable, Comparable<NaturalLogicRelation>

public enum NaturalLogicRelation
extends Enum<NaturalLogicRelation>

The catalog of the seven Natural Logic relations. Set-theoretically, if we assume A and B are two sets (e.g., denotations), and D is the universe of discourse, then the relations between A and B are defined as follows:

• Equivalence: A = B
• Forward entailment: A \\subset B
• Reverse entailment: A \\supset B
• Negation: A \\intersect B = \\empty \\land A \\union B = D
• Alternation: A \\intersect B = \\empty
• Cover: A \\union B = D

Author:

Gabor Angeli

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALTERNATION
COVER
EQUIVALENCE
FORWARD_ENTAILMENT
INDEPENDENCE
NEGATION
REVERSE_ENTAILMENT

Field Summary

Fields

Modifier and Type	Field and Description
int	fixedIndex
boolean	isEntailed
boolean	isNegated

Method Summary

Modifier and Type	Method and Description
protected static NaturalLogicRelation	byFixedIndex(int index)
NaturalLogicRelation	join(NaturalLogicRelation other) The MacCartney "join table" -- this determines the transitivity of entailment if we chain two relations together.
static NaturalLogicRelation	valueOf(String name) Returns the enum constant of this type with the specified name.
static NaturalLogicRelation[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

EQUIVALENCE

public static final NaturalLogicRelation EQUIVALENCE

FORWARD_ENTAILMENT

public static final NaturalLogicRelation FORWARD_ENTAILMENT

REVERSE_ENTAILMENT

public static final NaturalLogicRelation REVERSE_ENTAILMENT

NEGATION

public static final NaturalLogicRelation NEGATION

ALTERNATION

public static final NaturalLogicRelation ALTERNATION

COVER

public static final NaturalLogicRelation COVER

INDEPENDENCE

public static final NaturalLogicRelation INDEPENDENCE

Field Detail

fixedIndex

public final int fixedIndex

isEntailed

public final boolean isEntailed

isNegated

public final boolean isNegated

Method Detail

values

public static NaturalLogicRelation[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (NaturalLogicRelation c : NaturalLogicRelation.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static NaturalLogicRelation valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

byFixedIndex

protected static NaturalLogicRelation byFixedIndex(int index)

join

public NaturalLogicRelation join(NaturalLogicRelation other)

The MacCartney "join table" -- this determines the transitivity of entailment if we chain two relations together. These should already be projected up through the sentence, so that the relations being joined are relations between sentences rather than relations between lexical items (see Polarity.projectLexicalRelation(NaturalLogicRelation), set by NaturalLogicAnnotator using the NaturalLogicAnnotations.PolarityAnnotation).

Parameters:

other - The relation to join this relation with.

Returns:

The new joined relation.