Bug 152430 Key can modify to empty string
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/JoinConditionHandle.java
* 
 * <p>
 * <dl>
 * <dt><strong>Left Expression </strong></dt>
 * <dd>the left expression of the join condition.</dd>
 * </dl>
 * <p>
 * 
 * <p>
 * <dl>
 * <dt><strong>Right Expression </strong></dt>
 * <dd>the right expression of the join condition.</dd>
 * </dl>
 * <p>
 * 
 */
public class JoinConditionHandle extends StructureHandle
{
	/**
	 * Constructs the handle of join condition.
	 * 
	 * @param valueHandle
	 *            the value handle for join condition list of one property
	 * @param index
	 *            the position of this join condition in the list
	 */
	public JoinConditionHandle( SimpleValueHandle valueHandle, int index )
	{
		super( valueHandle, index );
	}