/**
 * Create a data block containing Ext.data.Records from an XML document.
 * @param {Object} doc A parsed XML document.
 * @return {Object} records A data block which is used by an {@link Ext.data.Store} as
 * a cache of Ext.data.Records.
 */
readRecords: function(doc) {
  /**
   * After any data loads/reads, the raw XML Document is available for further custom processing.
   * @type XMLDocument
   */
  this.xmlData = doc;
  var root = doc.documentElement || doc;
  var q = Ext.DomQuery;
  var recordType = this.recordType, fields = recordType.prototype.fields;
  var sid = this.meta.idPath || this.meta.id;
  var totalRecords = 0, success = true;
  if(this.meta.totalRecords){
    totalRecords = q.selectNumber(this.meta.totalRecords, root, 0);
  }

  if(this.meta.success){
    var sv = q.selectValue(this.meta.success, root, true);
    success = sv !== false && sv !== 'false';
  }
  var records = [];
  var ns = q.select(this.meta.record, root);
  for(var i = 0, len = ns.length; i < len; i++) {
    var n = ns[i];
    var values = {};
    var id = sid ? q.selectValue(sid, n) : undefined;
    for(var j = 0, jlen = fields.length; j < jlen; j++){
      var f = fields.items[j];
      var v = q.selectValue(Ext.value(f.mapping, f.name, true), n, f.defaultValue);
      v = f.convert(v, n);
      values[f.name] = v;
    }
    var record = new recordType(values, id);
    record.node = n;
    records[records.length] = record;
  }

  return {
    success : success,
    records : records,
    totalRecords : totalRecords || records.length
  };
}