Bug 176436 Charts Imported from Libraries do not update when libraries change
During a live presentation of BIRT at EclipseCon, we came across a rather embarassing issue. When charts are included in a library, and imported into a report design from a library, any changes to the library instance of the chart do not reflect in the report itself.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
* slot.
	 * 
	 * <p>
	 * For example,
	 * <ul>
	 * <li>/report/Body[1]/Label[3] - The third label element in body slot
	 * <li>/report/Styles[1]/Style[1] - The first style in the styles slot
	 * <li>/report/page-setup[1]/Graphic Master Page - The master page in the
	 * page setup slot.
	 * </ul>
	 * <p>
	 * Note: the localized name is used for element type and slot name.
	 * 
	 * @return the path of this element
	 */
	public String getXPath( )
	{
		return XPathUtil.getXPath( this );
	}
	/**
	 * Gets a string that defines the event handle class.
	 * 
	 * @return the expression as a string
	 * 
	 * @see #setEventHandlerClass(String)
	 */
	public String getEventHandlerClass( )
	{
		return getStringProperty( IDesignElementModel.EVENT_HANDLER_CLASS_PROP );
	}