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
* @return the meta object for class '<em>Number Data Set</em>'.
	 * @see org.eclipse.birt.chart.model.data.NumberDataSet
	 * @generated
	 */
	EClass getNumberDataSet( );
	/**
	 * Returns the meta object for class '{@link org.eclipse.birt.chart.model.data.OrthogonalSampleData <em>Orthogonal Sample Data</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for class '<em>Orthogonal Sample Data</em>'.
	 * @see org.eclipse.birt.chart.model.data.OrthogonalSampleData
	 * @generated
	 */
	EClass getOrthogonalSampleData( );
	/**
	 * Returns the meta object for the attribute '{@link org.eclipse.birt.chart.model.data.OrthogonalSampleData#getDataSetRepresentation <em>Data Set Representation</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the attribute '<em>Data Set Representation</em>'.
	 * @see org.eclipse.birt.chart.model.data.OrthogonalSampleData#getDataSetRepresentation()
	 * @see #getOrthogonalSampleData()
	 * @generated
	 */
	EAttribute getOrthogonalSampleData_DataSetRepresentation( );
	/**
	 * Returns the meta object for the attribute '{@link org.eclipse.birt.chart.model.data.OrthogonalSampleData#getSeriesDefinitionIndex <em>Series Definition Index</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the attribute '<em>Series Definition Index</em>'.
	 * @see org.eclipse.birt.chart.model.data.OrthogonalSampleData#getSeriesDefinitionIndex()
	 * @see #getOrthogonalSampleData()
	 * @generated
	 */