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