package edu.vt.marian.search;

import java.util.*;
import java.io.*;

import edu.vt.marian.common.*;


/**
 * SetCollectionSequencers are Sequencers that are built up component set by
	component set.  Each set is added individually, presumably before
	the Enumeration is begun.
   <P>
   Originally several addSet() methods were provided to facilitate adding 
	componenet sets with relative weights.  After the addition of the
	ScaledWtdObjSet, this complication became unnecessary and was dropped.
 *
 * @author Robert France
 * @see	Sequencer
 * @see java.util.Enumeration
 */

public interface SetCollectionSequencer extends Sequencer
{
	/**
	 * Add a new component set to the Sequencer.
	 *
	 * @param	set	a component weighted object set.
	 * @return	ReturnValues.OK -- set was added without problems.
	 * <BR>		anything else -- problems.
	 */
	public int addSet(WtdObjSet set);
}