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 the new adapter.
	 * @see org.eclipse.birt.chart.model.attribute.NumberFormatSpecifier
	 * @generated
	 */
	public Adapter createNumberFormatSpecifierAdapter( )
	{
		return null;
	}
	/**
	 * Creates a new adapter for an object of class '{@link org.eclipse.birt.chart.model.attribute.Palette <em>Palette</em>}'.
	 * <!-- begin-user-doc --> This default implementation returns null so that
	 * we can easily ignore cases; it's useful to ignore a case when inheritance
	 * will catch all the cases anyway. <!-- end-user-doc -->
	 * @return the new adapter.
	 * @see org.eclipse.birt.chart.model.attribute.Palette
	 * @generated
	 */
	public Adapter createPaletteAdapter( )
	{
		return null;
	}
	/**
	 * Creates a new adapter for an object of class '{@link org.eclipse.birt.chart.model.attribute.Polygon <em>Polygon</em>}'.
	 * <!-- begin-user-doc -->
	 * This default implementation returns null so that we can easily ignore cases;
	 * it's useful to ignore a case when inheritance will catch all the cases anyway.
	 * <!-- end-user-doc -->
	 * @return the new adapter.
	 * @see org.eclipse.birt.chart.model.attribute.Polygon
	 * @generated