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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.ling;

import edu.stanford.nlp.util.CoreMap;
import edu.stanford.nlp.util.TypesafeMap;

/**
 * The base class for any annotation that can be marked on a {@link CoreMap},
 * parameterized by the type of the value associated with the annotation.
 * Subclasses of this class are the keys in the {@link CoreMap}, so they are
 * instantiated only by utility methods in {@link CoreAnnotations}.
 * 
 * @author dramage
 * @author rafferty
 */
public interface CoreAnnotation
  extends TypesafeMap.Key {

  /**
   * Returns the type associated with this annotation.  This method must
   * return the same class type as its value type parameter.  It feels like
   * one should be able to get away without this method, but because Java
   * erases the generic type signature, that info disappears at runtime.
   */
  public Class getType();
}