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Table 6 

Non-relational features for IS classification. “b” indicates binary features, “n” nominal features, “l” lexical features, “int” integer. A nominal feature draws the feature value from a restricted set. A lexical feature indicates the presence or absence of a lexical unit in a mention. The value “NA” stands for “not applicable” and is used for pronouns.

FeatureValue
Features from previous work (Nissim 2006; Rahman and Ng 2011) 
p1 FullPrevMention (n) {yes, no, NA}1 
p2 FullMentionTime (n) {first, second, more, NA
p3 HeadMatch (n) {yes, no, NA
p4 NPlength (int) numeric, e.g., 5 
p5 Determiner (n) {def, indef, dem, poss, bare, NA
p6 GrammaticalRole (n) {subject, subjpass, object, predicate, pp, other
p7 NPType (n) {common noun, proper noun, pronoun, other
p8 Unigrams (l) e.g., his, the, China 
  
New features for identifying several IS classes (non-bridging) 
g1 HeadMatchTime (n) {first, second, more, NA
g2 ContentWordPreMention (b) {yes, no, NA
g3 IsFrequentProperName (b) {yes, no
g4 PreModByCompMarker (b) {yes, no
g5 DependOnChangeVerb (b) {yes, no
  
New features for recognizing bridging anaphora 
Discourse structure 
f1 IsCoherenceGap (b) {yes, no
f2 IsSentFirstMention (b) {yes, no
f3 IsDocFirstMention (b) {yes, no
Lexico-semantics 
f4 IsArgumentTakingNP (b) {yes, no
f5 IsWordNetRelationalNoun (b) {yes, no
f6 IsInquirerRoleNoun (b) {yes, no
f7 SemanticClass (n) a list of 16 classes, e.g., location, organization 
f8 IsBuildingPart (b) {yes, no
f9 IsSetElement (b) {yes, no
f10 ModSpatialTemporal (b) {yes, no
f11 IsYear (b) {yes, no
f12 PreModifiedByCountry (b) {yes, no
Identifying generic NPs 
f13 AppearInIfClause (b) {yes, no
f14 NPNumber (n) {singular, plural, unknown
f15 VerbPosTag (l) e.g., VBG, MD, VB 
f16 IsFrequentGenericNP (b) {yes, no
f17 GeneralWorldKnowledge(l) e.g., the sun, the wind 
f18 PreModByGenericQuantifier (b) {yes, no
Mention syntactic structure 
f19 HasChildMention (b) {yes, no
FeatureValue
Features from previous work (Nissim 2006; Rahman and Ng 2011) 
p1 FullPrevMention (n) {yes, no, NA}1 
p2 FullMentionTime (n) {first, second, more, NA
p3 HeadMatch (n) {yes, no, NA
p4 NPlength (int) numeric, e.g., 5 
p5 Determiner (n) {def, indef, dem, poss, bare, NA
p6 GrammaticalRole (n) {subject, subjpass, object, predicate, pp, other
p7 NPType (n) {common noun, proper noun, pronoun, other
p8 Unigrams (l) e.g., his, the, China 
  
New features for identifying several IS classes (non-bridging) 
g1 HeadMatchTime (n) {first, second, more, NA
g2 ContentWordPreMention (b) {yes, no, NA
g3 IsFrequentProperName (b) {yes, no
g4 PreModByCompMarker (b) {yes, no
g5 DependOnChangeVerb (b) {yes, no
  
New features for recognizing bridging anaphora 
Discourse structure 
f1 IsCoherenceGap (b) {yes, no
f2 IsSentFirstMention (b) {yes, no
f3 IsDocFirstMention (b) {yes, no
Lexico-semantics 
f4 IsArgumentTakingNP (b) {yes, no
f5 IsWordNetRelationalNoun (b) {yes, no
f6 IsInquirerRoleNoun (b) {yes, no
f7 SemanticClass (n) a list of 16 classes, e.g., location, organization 
f8 IsBuildingPart (b) {yes, no
f9 IsSetElement (b) {yes, no
f10 ModSpatialTemporal (b) {yes, no
f11 IsYear (b) {yes, no
f12 PreModifiedByCountry (b) {yes, no
Identifying generic NPs 
f13 AppearInIfClause (b) {yes, no
f14 NPNumber (n) {singular, plural, unknown
f15 VerbPosTag (l) e.g., VBG, MD, VB 
f16 IsFrequentGenericNP (b) {yes, no
f17 GeneralWorldKnowledge(l) e.g., the sun, the wind 
f18 PreModByGenericQuantifier (b) {yes, no
Mention syntactic structure 
f19 HasChildMention (b) {yes, no
1

We changed the value of “f 1 FullPrevMention” from “numeric” to {yes, no, NA}.

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