    /**
     * @author Ed Spencer
     * @class Ext.data.writer.Xml

    This class is used to write {@link Ext.data.Model} data to the server in an XML format.
    The {@link #documentRoot} property is used to specify the root element in the XML document.
    The {@link #record} option is used to specify the element name for each record that will make
    up the XML document.

     * @markdown
     */
    Ext.define('Ext.data.writer.Xml', {

        /* Begin Definitions */

        extend: 'Ext.data.writer.Writer',
        alternateClassName: 'Ext.data.XmlWriter',

        alias: 'writer.xml',

        /* End Definitions */

        /**
         * @cfg {String} documentRoot The name of the root element of the document. Defaults to <tt>'xmlData'</tt>.
         * If there is more than 1 record and the root is not specified, the default document root will still be used
         * to ensure a valid XML document is created.
         */
        documentRoot: 'xmlData',

        /**
         * @cfg {String} defaultDocumentRoot The root to be used if {@link #documentRoot} is empty and a root is required
         * to form a valid XML document.
         */
        defaultDocumentRoot: 'xmlData',

        /**
         * @cfg {String} header A header to use in the XML document (such as setting the encoding or version).
         * Defaults to <tt>''</tt>.
         */
        header: '',

        /**
         * @cfg {String} record The name of the node to use for each record. Defaults to <tt>'record'</tt>.
         */
        record: 'record',

        //inherit docs
        writeRecords: function(request, data) {
            var me = this,
                xml = [],
                i = 0,
                len = data.length,
                root = me.documentRoot,
                record = me.record,
                needsRoot = data.length !== 1,
                item,
                key;

            // may not exist
            xml.push(me.header || '');

            if (!root && needsRoot) {
                root = me.defaultDocumentRoot;
            }

            if (root) {
                xml.push('<', root, '>');
            }

            for (; i < len; ++i) {
                item = data[i];
                xml.push('<', record, '>');
                for (key in item) {
                    if (item.hasOwnProperty(key)) {
                        xml.push('<', key, '>', item[key], '</', key, '>');
                    }
                }
                xml.push('</', record, '>');
            }

            if (root) {
                xml.push('</', root, '>');
            }

            request.xmlData = xml.join('');
            return request;
        }
    });