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
* <!-- end-user-doc -->
	 * @see java.lang.Object
	 * @see org.eclipse.birt.chart.model.data.impl.DataPackageImpl#getData()
	 * @generated
	 */
	int DATA = 20;
	/**
	 * Returns the meta object for class '
	 * {@link org.eclipse.birt.chart.model.data.Action <em>Action</em>}'. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @return the meta object for class '<em>Action</em>'.
	 * @see org.eclipse.birt.chart.model.data.Action
	 * @generated
	 */
	EClass getAction( );
	/**
	 * Returns the meta object for the attribute '{@link org.eclipse.birt.chart.model.data.Action#getType <em>Type</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the attribute '<em>Type</em>'.
	 * @see org.eclipse.birt.chart.model.data.Action#getType()
	 * @see #getAction()
	 * @generated
	 */
	EAttribute getAction_Type( );
	/**
	 * Returns the meta object for the containment reference '{@link org.eclipse.birt.chart.model.data.Action#getValue <em>Value</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the containment reference '<em>Value</em>'.
	 * @see org.eclipse.birt.chart.model.data.Action#getValue()