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Table 2 

Description of all 70 basic features.

IdDescriptionType#
 Lexical Features  25 
L1 Head word of i (jword 
L2 String matching of i and j boolean 
L3 String matching of the head words of i and j boolean 
L4 Both i and j are pronouns and their strings match ternary 
L5 Both i and j are not pronouns and their string match ternary 
L6 Previous and next two words of i (jword 
L7 Number of tokens in i (jinteger 
L8 Edit distance of head words of i and j integer 
L9 Edit distance of i and j after removing determiners integer 
L10 i (j) is a definite noun phrase boolean 
L11 i (j) is a demonstrative noun phrase boolean 
L12 The head word of both i and j are proper nouns boolean 
L13 Both i and j are proper names and their strings match ternary 
L14 Both i and j are proper names and their head word strings match ternary 
 
 Syntactic Features  28 
Sy1 POS tag of the head word of i (jPOS tag 
Sy2 Previous and next two POS tags of i (jPOS tag 
Sy3 i (j) is a pronoun boolean 
Sy4 Gender of i (j), if pronoun f, m, n/a 
Sy5 i and j are both pronouns and agree in gender ternary 
Sy6 i and j are both pronouns and agree in number ternary 
Sy7 i (j) is a proper name boolean 
Sy8 i and j are both proper names boolean 
Sy9 Previous and next predicate of i (j) within its sentence verb 
Sy10 i and j are pronouns and agree in number, gender, and person ternary 
Sy11 Noun phrase embedding level of i (j) in the syntactic parse integer 
Sy12 Number of embedded noun phrases in i (jinteger 
 
 Semantic Features  13 
Se1 Baseline system prediction binary 
Se2 Sense of the head word of i (jsense 
Se3 Named entity type of i (jNE tag 
Se4 i and j have the same named entity type ternary 
Se5 Previous and next semantic roles for i (j) within its sentence SRL tag 
Se6 Concatenation of semantic roles of i and j for the same predicate, if they are in the same sentence (SRL tag)2 
Se7 i and j have the same speaker ternary 
Se8 j is an alias of i as suggested by Ng and Cardie (2002) boolean 
 
 Positional Features  4 
P1 Distance between i and j in number of sentences integer 
P2 Distance between i and j in number of mentions integer 
P3 Distance between i and j in number of person names, when i and j are both pronouns or one of them is a person name integer 
P4 One mention is in apposition to the other boolean 
IdDescriptionType#
 Lexical Features  25 
L1 Head word of i (jword 
L2 String matching of i and j boolean 
L3 String matching of the head words of i and j boolean 
L4 Both i and j are pronouns and their strings match ternary 
L5 Both i and j are not pronouns and their string match ternary 
L6 Previous and next two words of i (jword 
L7 Number of tokens in i (jinteger 
L8 Edit distance of head words of i and j integer 
L9 Edit distance of i and j after removing determiners integer 
L10 i (j) is a definite noun phrase boolean 
L11 i (j) is a demonstrative noun phrase boolean 
L12 The head word of both i and j are proper nouns boolean 
L13 Both i and j are proper names and their strings match ternary 
L14 Both i and j are proper names and their head word strings match ternary 
 
 Syntactic Features  28 
Sy1 POS tag of the head word of i (jPOS tag 
Sy2 Previous and next two POS tags of i (jPOS tag 
Sy3 i (j) is a pronoun boolean 
Sy4 Gender of i (j), if pronoun f, m, n/a 
Sy5 i and j are both pronouns and agree in gender ternary 
Sy6 i and j are both pronouns and agree in number ternary 
Sy7 i (j) is a proper name boolean 
Sy8 i and j are both proper names boolean 
Sy9 Previous and next predicate of i (j) within its sentence verb 
Sy10 i and j are pronouns and agree in number, gender, and person ternary 
Sy11 Noun phrase embedding level of i (j) in the syntactic parse integer 
Sy12 Number of embedded noun phrases in i (jinteger 
 
 Semantic Features  13 
Se1 Baseline system prediction binary 
Se2 Sense of the head word of i (jsense 
Se3 Named entity type of i (jNE tag 
Se4 i and j have the same named entity type ternary 
Se5 Previous and next semantic roles for i (j) within its sentence SRL tag 
Se6 Concatenation of semantic roles of i and j for the same predicate, if they are in the same sentence (SRL tag)2 
Se7 i and j have the same speaker ternary 
Se8 j is an alias of i as suggested by Ng and Cardie (2002) boolean 
 
 Positional Features  4 
P1 Distance between i and j in number of sentences integer 
P2 Distance between i and j in number of mentions integer 
P3 Distance between i and j in number of person names, when i and j are both pronouns or one of them is a person name integer 
P4 One mention is in apposition to the other boolean 
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