public override void AddSort(object expr, XmlSortOrder orderSort, XmlCaseOrder orderCase, string lang, XmlDataType dataType)
 {
     if (this._sorters == null)
     {
         this._sorters = new XPathSorters();
     }
     this._sorters.Add(expr, orderSort, orderCase, lang, dataType);
 }
 public override void AddSort(object obj, IComparer cmp)
 {
     if (this._sorters == null)
     {
         this._sorters = new XPathSorters();
     }
     this._sorters.Add(obj, cmp);
 }