    /**
     * @class Ext.chart.series.Cartesian
     * @extends Ext.chart.series.Series
     *
     * Common base class for series implementations which plot values using x/y coordinates.
     *
     * @constructor
     */
    Ext.define('Ext.chart.series.Cartesian', {

        /* Begin Definitions */

        extend: 'Ext.chart.series.Series',

        alternateClassName: ['Ext.chart.CartesianSeries', 'Ext.chart.CartesianChart'],

        /* End Definitions */

        /**
         * The field used to access the x axis value from the items from the data
         * source.
         *
         * @cfg xField
         * @type String
         */
        xField: null,

        /**
         * The field used to access the y-axis value from the items from the data
         * source.
         *
         * @cfg yField
         * @type String
         */
        yField: null,

        /**
         * Indicates which axis the series will bind to
         *
         * @property axis
         * @type String
         */
        axis: 'left'
    });