System.Xml.Xsl.XsltOld.XsltCompileContext.ElementAvailable C# (CSharp) Method

        private bool ElementAvailable(string qname) {
            string name, prefix;
            PrefixQName.ParseQualifiedName(qname, out prefix, out name);
            string ns = this.manager.ResolveXmlNamespace(prefix);
            // msxsl:script - is not an "instruction" so we return false for it.
            if(ns == Keywords.s_XsltNamespace) {
                return (
                    name == Keywords.s_ApplyImports ||
                    name == Keywords.s_ApplyTemplates ||
                    name == Keywords.s_Attribute ||
                    name == Keywords.s_CallTemplate ||
                    name == Keywords.s_Choose ||
                    name == Keywords.s_Comment ||
                    name == Keywords.s_Copy ||
                    name == Keywords.s_CopyOf ||
                    name == Keywords.s_Element ||
                    name == Keywords.s_Fallback ||
                    name == Keywords.s_ForEach ||
                    name == Keywords.s_If ||
                    name == Keywords.s_Message ||
                    name == Keywords.s_Number ||
                    name == Keywords.s_ProcessingInstruction ||
                    name == Keywords.s_Text ||
                    name == Keywords.s_ValueOf ||
                    name == Keywords.s_Variable
                );
            }
            return false;
        }