Adding selectional restrictions ( semantic feature information , Hobbs 1977 ) does not solve the problem , because isolated features offer only part of the background knowledge necessary for reference disambiguation .
38 examples of elusive antecedents from published texts
J R Hobbs
But syntactic relations do not suffice to resolve anaphora : Hobbs ' ( 1976 ) algorithm for resolving the reference of pronouns , depending only on the surface syntax of sentences in the text , when applied to `` it '' in the example paragraph , fails in both cases to identify the most likely referent NP . Adding selectional restrictions ( semantic feature information , Hobbs 1977 ) does not solve the problem , because isolated features offer only part of the background knowledge necessary for reference disambiguation . Later , Hobbs ( 1979 , 1982 ) proposed a knowledge base in which information about language and the world would be encoded , and he emphasized the need for using `` salience '' in choosing facts from this knowledge base .
Adding selectional restrictions ( semantic feature information , @@CITATION ) does not solve the problem , because isolated features offer only part of the background knowledge necessary for reference disambiguation .