Bug 174872 Clean up chart model
The chart model contains unused attributes and components. Those just make it difficult to understand the model architecture, so they should be removed from the schema, and the EMF classes must re-generated. Examples are: ChartPreferences, Rule. We need to analyze the model to find out all unused ones. Note that this should not break backward compatibility, otherwise just make them deprecated.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/data/DataFactory.java
*/
	Query createQuery( );
	/**
	 * Returns a new object of class '<em>Rule</em>'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return a new object of class '<em>Rule</em>'.
	 * @generated
	 */
	Rule createRule( );
	/**
	 * Returns a new object of class '<em>Sample Data</em>'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return a new object of class '<em>Sample Data</em>'.
	 * @generated
	 */
	SampleData createSampleData( );
	/**
	 * Returns a new object of class '<em>Series Definition</em>'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return a new object of class '<em>Series Definition</em>'.
	 * @generated
	 */
	SeriesDefinition createSeriesDefinition( );
	/**
	 * Returns a new object of class '<em>Series Grouping</em>'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return a new object of class '<em>Series Grouping</em>'.
	 * @generated
	 */
	SeriesGrouping createSeriesGrouping( );