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 getOrientation( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.Position <em>Position</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Position</em>'.
	 * @see org.eclipse.birt.chart.model.attribute.Position
	 * @generated
	 */
	EEnum getPosition( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.RiserType <em>Riser Type</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Riser Type</em>'.
	 * @see org.eclipse.birt.chart.model.attribute.RiserType
	 * @generated
	 */
	EEnum getRiserType( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.RuleType <em>Rule Type</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Rule Type</em>'.
	 * @see org.eclipse.birt.chart.model.attribute.RuleType
	 * @generated
	 */
	EEnum getRuleType( );
	/**
	 * Returns the meta object for enum '{@link org.eclipse.birt.chart.model.attribute.ScaleUnitType <em>Scale Unit Type</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for enum '<em>Scale Unit Type</em>'.