Bug 184762 BIRT Model - Enhancments to the level defintion
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/elements/ElementVisitor.java
*            the image item to traverse
	 */
	public void visitImage( ImageItem obj )
	{
		visitReportItem( obj );
	}
	/**
	 * Visits the listing item element.
	 * 
	 * @param obj
	 *            the listing item to traverse
	 */
	public void visitListing( ListingElement obj )
	{
		visitReportItem( obj );
	}
	/**
	 * Visits the list item element.
	 * 
	 * @param obj
	 *            the list item to traverse
	 */
	public void visitList( ListItem obj )
	{
		visitListing( obj );
	}
	/**
	 * Visits the group element,such as table group and list group.
	 * 
	 * @param obj