Bug 202254 Exception is thrown when category values are null and type of X axis is set to DateTime
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/data/DataPackage.java
EAttribute getOrthogonalSampleData_SeriesDefinitionIndex( );
	/**
	 * Returns the meta object for class '
	 * {@link org.eclipse.birt.chart.model.data.Query <em>Query</em>}'. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @return the meta object for class '<em>Query</em>'.
	 * @see org.eclipse.birt.chart.model.data.Query
	 * @generated
	 */
	EClass getQuery( );
	/**
	 * Returns the meta object for the attribute '{@link org.eclipse.birt.chart.model.data.Query#getDefinition <em>Definition</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the attribute '<em>Definition</em>'.
	 * @see org.eclipse.birt.chart.model.data.Query#getDefinition()
	 * @see #getQuery()
	 * @generated
	 */
	EAttribute getQuery_Definition( );
	/**
	 * Returns the meta object for the containment reference list '{@link org.eclipse.birt.chart.model.data.Query#getRules <em>Rules</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the containment reference list '<em>Rules</em>'.
	 * @see org.eclipse.birt.chart.model.data.Query#getRules()
	 * @see #getQuery()
	 * @generated
	 */
	EReference getQuery_Rules( );
	/**