The source code

    /**
     * @class Ext.data.XmlStore
     * @extends Ext.data.Store
     * <p>Small helper class to make creating {@link Ext.data.Store}s from XML data easier.
     * A XmlStore will be automatically configured with a {@link Ext.data.XmlReader}.</p>
     * <p>A store configuration would be something like:<pre><code>
    var store = new Ext.data.XmlStore({
        // store configs
        autoDestroy: true,
        storeId: 'myStore',
        url: 'sheldon.xml', // automatically configures a HttpProxy
        // reader configs
        record: 'Item', // records will have an "Item" tag
        idPath: 'ASIN',
        totalRecords: '@TotalResults'
        fields: [
            // set up the fields mapping into the xml doc
            // The first needs mapping, the others are very basic
            {name: 'Author', mapping: 'ItemAttributes > Author'},
            'Title', 'Manufacturer', 'ProductGroup'
        ]
    });
     * </code></pre></p>
     * <p>This store is configured to consume a returned object of the form:<pre><code>
    &#60?xml version="1.0" encoding="UTF-8"?>
    &#60ItemSearchResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2009-05-15">
        &#60Items>
            &#60Request>
                &#60IsValid>True&#60/IsValid>
                &#60ItemSearchRequest>
                    &#60Author>Sidney Sheldon&#60/Author>
                    &#60SearchIndex>Books&#60/SearchIndex>
                &#60/ItemSearchRequest>
            &#60/Request>
            &#60TotalResults>203&#60/TotalResults>
            &#60TotalPages>21&#60/TotalPages>
            &#60Item>
                &#60ASIN>0446355453&#60/ASIN>
                &#60DetailPageURL>
                    http://www.amazon.com/
                &#60/DetailPageURL>
                &#60ItemAttributes>
                    &#60Author>Sidney Sheldon&#60/Author>
                    &#60Manufacturer>Warner Books&#60/Manufacturer>
                    &#60ProductGroup>Book&#60/ProductGroup>
                    &#60Title>Master of the Game&#60/Title>
                &#60/ItemAttributes>
            &#60/Item>
        &#60/Items>
    &#60/ItemSearchResponse>
     * </code></pre>
     * An object literal of this form could also be used as the {@link #data} config option.</p>
     * <p><b>Note:</b> Although not listed here, this class accepts all of the configuration options of
     * <b>{@link Ext.data.XmlReader XmlReader}</b>.</p>
     * @constructor
     * @param {Object} config
     * @xtype xmlstore
     */
    Ext.data.XmlStore = Ext.extend(Ext.data.Store, {
        /**
         * @cfg {Ext.data.DataReader} reader @hide
         */
        constructor: function(config){
            Ext.data.XmlStore.superclass.constructor.call(this, Ext.apply(config, {
                reader: new Ext.data.XmlReader(config)
            }));
        }
    });
    Ext.reg('xmlstore', Ext.data.XmlStore);