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/AttributeValidator.java
context );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public boolean validatePalette( Palette palette,
			DiagnosticChain diagnostics, Map context )
	{
		return validate_EveryDefaultConstraint( palette, diagnostics, context );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public boolean validatePolygon( Polygon polygon,
			DiagnosticChain diagnostics, Map context )
	{
		return validate_EveryDefaultConstraint( polygon, diagnostics, context );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public boolean validateRotation3D( Rotation3D rotation3D,
			DiagnosticChain diagnostics, Map context )
	{
		return validate_EveryDefaultConstraint( rotation3D,
				diagnostics,
				context );