System.Xml.Xsl.Xslt.XsltLoader.LoadNamespaceAlias C# (CSharp) Method

        private void LoadNamespaceAlias(NsDecl stylesheetNsList)
        {
            ContextInfo ctxInfo = _input.GetAttributes(_namespaceAliasAttributes);
            ctxInfo.nsList = MergeNamespaces(ctxInfo.nsList, stylesheetNsList);

            string stylesheetNsUri = null;
            string resultPrefix = null;
            string resultNsUri = null;

            if (_input.MoveToXsltAttribute(0, "stylesheet-prefix"))
            {
                if (_input.Value.Length == 0)
                {
                    ReportError(/*[XT_005]*/SR.Xslt_EmptyNsAlias, "stylesheet-prefix");
                }
                else
                {
                    stylesheetNsUri = _input.LookupXmlNamespace(_input.Value == "#default" ? string.Empty : _input.Value);
                }
            }

            if (_input.MoveToXsltAttribute(1, "result-prefix"))
            {
                if (_input.Value.Length == 0)
                {
                    ReportError(/*[XT_005]*/SR.Xslt_EmptyNsAlias, "result-prefix");
                }
                else
                {
                    resultPrefix = _input.Value == "#default" ? string.Empty : _input.Value;
                    resultNsUri = _input.LookupXmlNamespace(resultPrefix);
                }
            }

            CheckNoContent();

            if (stylesheetNsUri == null || resultNsUri == null)
            {
                // At least one of attributes is missing or invalid
                return;
            }
            if (_compiler.SetNsAlias(stylesheetNsUri, resultNsUri, resultPrefix, _curStylesheet.ImportPrecedence))
            {
                // Namespace alias redefinition
                _input.MoveToElement();
                ReportWarning(/*[XT0810]*/SR.Xslt_DupNsAlias, stylesheetNsUri);
            }
        }