/**
  * Adds to, not sets. Anything that adds to instead of setting needs a clear function as well.
  *
  * @param relChange
  * @throws GameParseException
  */
 @GameProperty(xmlProperty = true, gameProperty = true, adds = true)
 public void setRelationshipChange(final String relChange) throws GameParseException {
   final String[] s = relChange.split(":");
   if (s.length != 3)
     throw new GameParseException(
         "Invalid relationshipChange declaration: "
             + relChange
             + " \n Use: player1:player2:newRelation\n"
             + thisErrorMsg());
   if (getData().getPlayerList().getPlayerID(s[0]) == null)
     throw new GameParseException(
         "Invalid relationshipChange declaration: "
             + relChange
             + " \n player: "
             + s[0]
             + " unknown in: "
             + getName()
             + thisErrorMsg());
   if (getData().getPlayerList().getPlayerID(s[1]) == null)
     throw new GameParseException(
         "Invalid relationshipChange declaration: "
             + relChange
             + " \n player: "
             + s[1]
             + " unknown in: "
             + getName()
             + thisErrorMsg());
   if (!Matches.isValidRelationshipName(getData()).match(s[2]))
     throw new GameParseException(
         "Invalid relationshipChange declaration: "
             + relChange
             + " \n relationshipType: "
             + s[2]
             + " unknown in: "
             + getName()
             + thisErrorMsg());
   m_relationshipChange.add(relChange);
 }