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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.ie.machinereading.domains.ace.reader;

import java.util.List;
import java.util.ArrayList;

/**
 * Stores one ACE relation
 */
public class AceRelation extends AceElement {
  private String mType;

  private String mSubtype;

  private String mModality;

  private String mTense;

  /** The list of mentions for this event */
  private List mMentions;

  public static final String NIL_LABEL = "nil";

  public AceRelation(String id,
		     String type,
		     String subtype,
		     String modality,
		     String tense) {
    super(id);
    mType = type;
    mSubtype = subtype;
    mModality = modality;
    mTense = tense;
    mMentions = new ArrayList<>();
  }

  public void addMention(AceRelationMention m) { 
    mMentions.add(m); 
    m.setParent(this);
  }
  
  public AceRelationMention getMention(int which) { 
    return mMentions.get(which); 
  }
  public int getMentionCount() { return mMentions.size(); }

  public String getType() { return mType; }
  public void setType(String s) { mType = s; }
  public String getSubtype() { return mSubtype; }
  public void setSubtype(String s) { mSubtype = s; }

  public String toXml(int offset) {
    StringBuffer buffer = new StringBuffer();
    appendOffset(buffer, offset);
    buffer.append("\n");

    AceRelationMentionArgument arg1 = mMentions.get(0).getArgs()[0];
    AceRelationMentionArgument arg2 = mMentions.get(0).getArgs()[1];
    if(arg1.getRole().equals("Arg-1")){ // left to right
      buffer.append(arg1.toXmlShort(offset + 2) + "\n");
      buffer.append(arg2.toXmlShort(offset + 2) + "\n");  
    } else { // right to left
      buffer.append(arg2.toXmlShort(offset + 2) + "\n");
      buffer.append(arg1.toXmlShort(offset + 2) + "\n");  
    }  

    for(AceRelationMention m: mMentions){
      buffer.append(m.toXml(offset + 2));
      buffer.append("\n");
    }

    appendOffset(buffer, offset);
    buffer.append("");
    return buffer.toString();
  }
}