System.Xml.Xsl.XsltOld.Compiler.ValidateExtensionNamespace C# (CSharp) Method

        private static void ValidateExtensionNamespace(string nsUri)
        {
            if (nsUri.Length == 0 || nsUri == XmlReservedNs.NsXslt)
            {
                throw XsltException.Create(SR.Xslt_InvalidExtensionNamespace);
            }
            XmlConvert.ToUri(nsUri);
        }