code: @SuppressWarnings("unchecked")
  	public Individual<T,S> resolve(DataSet dataSet) {
  		return (Individual<T,S>) dataSet.individualOfId(ref());
  	}
docs: Find the individual of the data set with the same identifier
  
  @param dataSet
  the data set
  @return the individual with the same identifier, or {@code null} if no
  individual has the same identifier.