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
depth = 1;
			}
		}
	}
	/**
	 * Returns a reference to the parent.
	 * <p>
	 * <strong>property.list[n].member.list[n][member] </strong>
	 * 
	 * @return a reference to the parent member
	 */
	public MemberRef getParentRef( )
	{
		if ( depth == 1 )
			return null;
		return new MemberRef( propDefn, index[0], member[0] );
	}
	/**
	 * Gets the value of the referenced property, structure, or member.
	 * 
	 * @param module
	 *            the module
	 * 
	 * @param element
	 *            the element for which to retrieve the value
	 * @return the retrieved value, which may be null
	 */
	public Object getValue( Module module, DesignElement element )
	{
		Structure struct = getStructure( module, element );