Bug 104986 Backgound image uses an absolute path
Currently Chart uses an absolute path to indicate a backgournd image, that may cause the design unusable on other environments. Expected the background image can be definded in multiple ways like in report designer. e.g. URI(absolute path), File(relative path), Embedded Image(Encoded Image Data).
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/attribute/util/AttributeAdapterFactory.java
return false;
	}
	/**
	 * The switch the delegates to the <code>createXXX</code> methods. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @generated
	 */
	protected AttributeSwitch modelSwitch = new AttributeSwitch( ) {
		public Object caseActionValue( ActionValue object )
		{
			return createActionValueAdapter( );
		}
		public Object caseAngle3D( Angle3D object )
		{
			return createAngle3DAdapter( );
		}
		public Object caseAxisOrigin( AxisOrigin object )
		{
			return createAxisOriginAdapter( );
		}
		public Object caseBounds( Bounds object )
		{
			return createBoundsAdapter( );
		}
		public Object caseCallBackValue( CallBackValue object )
		{
			return createCallBackValueAdapter( );
		}
		public Object caseColorDefinition( ColorDefinition object )