Mention phrase is group of words headed by

Mention Types Named EntityProper Name          In wikiCoref NEs are proper names, NPs or abbreviations .Typically an NE may be a person ,organization , an event , a facility and a geopolitical entity.NEs are considered to be atomic.            For example:            The sub-mention Montreal in the full mention University of Montreal. As well as units of measures and expressions referring to money if they occur within a numerical entity.             For example:Celsius and Euro signs in the mentions 30 C ? and 1000 AC are not marked independentlyIf mentioned is NE and preceded by the definite article “the” ,latter is added into span and mention type is always NE . For example:In “The United States” the whole span is marked as a NE.In ACL Anthology NEs are usually (definite) NPs .NEs may be among others, names of companies,organizations, persons,locations,languages, currencies, programming languages,standards, scientific fields,systems, frameworks etc.As a special case citations in scientific papers are also NEs.AbbreviationsThe abbreviations are also marked as coreference chains for the understanding of document.Noun phrases        In wikiCoref Noun phrase is group of words headed by a noun,or pronoun are marked as Np when they are not classified as NE.Definite Noun PhrasesIn wikiCoref Noun phrases which have definite description usually beginning with the definite article “the”.In ACL Anthology definite NP begins with the definite article “the” or a demonstrative determiner such as “that” , “those”, “this”,”those”.Indefinite Noun PhrasesIn wikiCoref Noun phrases which have indefinite description usually beginning with the definite article “a” or “an”.In ACl Anthology indefinite NPs are NPs which do not correspond to a specific and identifiable entity in a given context. Mostly marked by “a” and “and”.Or indicated by the lack of certain indicator.ConjunctionsIn wikiCoref conjunction phrase is having at least two Nps Connected by a coordinating or correlative conjunction. For Example: And, or, as well as etc.In this type of noun phrase the did not annotate the discontinuous markables.           Unlike named entities we annotate mentions embedded within NP mentions                         whatever the type of the mention is. For example, we mark the pronoun his in the              NP mention his father, and Obama in the Obama family. In ACl Anthology conjunction is an NP which results by conjoining other Nps For Example:Both, and, or, as well etc.              1.2.5 Nominal ModifiersPronominal Personal pronounThe personal pronoun is a pronoun that is associated primarily with a particular person, in the grammatical sense.  For Example: I,we,they you,he,she it, SIngular Noun,Plural Noun etc.Reflexive pronounA reflexive pronoun is a type of pronoun that is preceded by the adverb,  adjective, pronoun, or noun to which it refers, so long as that antecedent is located within the same clause. For Example: myself,yourself,themselves etc.Possessive pronoun/GenitivePossessive pronouns are those designating possession. They may also be used as substitutes for noun phrases, and they are typically found at the end of a sentence or clause.For Example: His,hers,mine,ours etc.Demonstrative pronounA demonstrative pronoun is a pronoun that is used to point to something specific within a sentence. These pronouns can indicate items in space or time, and they can be either singular or plural. For Example:this,these,that,those,it etc.Relative pronounA relative pronoun is one which is used to refer to nouns mentioned previously, whether they are people, places, things, animals, or ideas. Relative pronouns can be used to join two sentences.For Example:which,where,who etc.In ACL anthology they are only interested in relative pronouns that introduce non-restrictive relative clauses. In restrictive relative clauses, the relative pronoun does not refer to any real-world entity and therefore it can’t be= a coreferential markable (The relative pronoun refers syntactically to the head noun of the noun phrase (NP) to which the relative clause belongs, however, this is no coreference; the NP is semantically incomplete without the relative clause). In non-restrictive clauses, the relative pronoun really corefers with the noun phrase (NP) to which the relative clause belongs.

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