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/Structure.java
if ( !ref.isResolved( ) )
			return ref;
		DesignElement me = getContextElement( );
		
		if ( me instanceof ReferenceableElement
				&& ModelUtil.isRecursiveReference( ref.getElement( ),
						(ReferenceableElement) me ) )
		{
			ref.unresolved( ref.getName( ) );
			return ref;
		}
		String propName = getContextPropertyName( );
		
		if ( me != null && propName != null )
			ref.getTargetElement( ).addClient( me, propName );
		return ref;
	}
	/**
	 * Gets the locale value of a property.
	 * 
	 * @param module
	 *            the module
	 * 
	 * @param memberName
	 *            name of the member to get
	 * @return value of the item as an object, or null if the item is not set
	 *         locally or is not found.
	 */
	public Object getLocalProperty( Module module, String memberName )
	{