Bug 181121 Model should provide utility method for cube to get correspond dimension key.
In model cube handle, the relation of cube data set and dimension data sets are managed by a series of dimension condition handles.We need model to add utility method so that we can easily get corresponding dimension data set column names according to given cube dimension keys.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/MemberRef.java
* <li>property.member.member</li>
 * <li>property.member.list[n]</li>
 * <li>property.member.list[n].member</li>
 * 
 * <li>property.list[n]</li>
 * <li>property.list[n].member</li>
 * <li>property.list[n].member.list[n]</li>
 * <li>property.list[n].member.list[n].member</li>
 * <li>property.list[n].member.member</li>
 * 
 * </ul>
 * <p>
 * The reference supports up to two level of list.member identification. This is
 * the most used by the element definitions.
 * 
 */
public class MemberRef
{
	public final static int PROPERTY = 0;
	public final static int PROPERTY_MEMBER = 1;
	public final static int PROPERTY_MEMBER_MEMBER = 2;
	public final static int PROPERTY_MEMBER_LISTn = 3;
	public final static int PROPERTY_MEMBER_LISTn_MEMBER = 4;
	public final static int PROPERTY_LISTn = 5;
	public final static int PROPERTY_LISTn_MEMBER = 6;
	public final static int PROPERTY_LISTn_MEMBER_LISTn = 7;
	public final static int PROPERTY_LISTn_MEMBER_LISTn_MEMBER = 8;
	public final static int PROPERTY_LISTn_MEMBER_MEMBER = 9;
	public final int refType;
	/**