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
*/
	int DATE_FORMAT_TYPE_OBJECT = 78;
	/**
	 * The meta object id for the '<em>Direction Object</em>' data type.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see org.eclipse.birt.chart.model.attribute.Direction
	 * @see org.eclipse.birt.chart.model.attribute.impl.AttributePackageImpl#getDirectionObject()
	 * @generated
	 */
	int DIRECTION_OBJECT = 79;
	/**
	 * The meta object id for the '<em>Grouping Unit Type Object</em>' data type.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see org.eclipse.birt.chart.model.attribute.GroupingUnitType
	 * @see org.eclipse.birt.chart.model.attribute.impl.AttributePackageImpl#getGroupingUnitTypeObject()
	 * @generated
	 */
	int GROUPING_UNIT_TYPE_OBJECT = 80;
	/**
	 * The meta object id for the '<em>Horizontal Alignment Object</em>' data type.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see org.eclipse.birt.chart.model.attribute.HorizontalAlignment
	 * @see org.eclipse.birt.chart.model.attribute.impl.AttributePackageImpl#getHorizontalAlignmentObject()
	 * @generated
	 */
	int HORIZONTAL_ALIGNMENT_OBJECT = 81;
	/**
	 * The meta object id for the '<em>ID</em>' data type. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 *