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/AttributePackage.java
*/
	EEnum getDateFormatType( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.Direction <em>Direction</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Direction</em>'.
	 * @see org.eclipse.birt.chart.model.attribute.Direction
	 * @generated
	 */
	EEnum getDirection( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.GroupingUnitType <em>Grouping Unit Type</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Grouping Unit Type</em>'.
	 * @see org.eclipse.birt.chart.model.attribute.GroupingUnitType
	 * @generated
	 */
	EEnum getGroupingUnitType( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.HorizontalAlignment <em>Horizontal Alignment</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Horizontal Alignment</em>'.
	 * @see org.eclipse.birt.chart.model.attribute.HorizontalAlignment
	 * @generated
	 */
	EEnum getHorizontalAlignment( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.IntersectionType <em>Intersection Type</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Intersection Type</em>'.