System.Xml.Xsl.Xslt.XsltQilFactory.DefaultValueMarker C# (CSharp) Method

        public QilNode DefaultValueMarker() {
            return QName("default-value", XmlReservedNs.NsXslDebug);
        }

        public QilNode GenerateInvoke(QilFunction func, IList <XslNode> actualArgs)
        {
            _iterStack.Clear();
            _formalArgs = func.Arguments;
            _invokeArgs = _fac.ActualParameterList();

            // curArg is an instance variable used in Clone() method
            for (_curArg = 0; _curArg < _formalArgs.Count; _curArg++)
            {
                // Find actual value for a given formal arg
                QilParameter formalArg = (QilParameter)_formalArgs[_curArg];
                QilNode?     invokeArg = FindActualArg(formalArg, actualArgs);

                // If actual value was not specified, use the default value and copy its debug comment
                if (invokeArg == null)
                {
                    if (_debug)
                    {
                        if (formalArg.Name !.NamespaceUri == XmlReservedNs.NsXslDebug)
                        {
                            Debug.Assert(formalArg.Name.LocalName == "namespaces", "Cur,Pos,Last don't have default values and should be always added to by caller in AddImplicitArgs()");
                            Debug.Assert(formalArg.DefaultValue != null, "PrecompileProtoTemplatesHeaders() set it");
                            invokeArg = Clone(formalArg.DefaultValue);
                        }
                        else
                        {
                            invokeArg = _fac.DefaultValueMarker();
                        }
                    }
                    else
                    {
                        Debug.Assert(formalArg.Name !.NamespaceUri != XmlReservedNs.NsXslDebug, "Cur,Pos,Last don't have default values and should be always added to by caller in AddImplicitArgs(). We don't have $namespaces in !debug.");
                        invokeArg = Clone(formalArg.DefaultValue !);
                    }
                }

                XmlQueryType formalType = formalArg.XmlType !;
                XmlQueryType invokeType = invokeArg.XmlType !;

                // Possible arg types: anyType, node-set, string, boolean, and number
                _fac.CheckXsltType(formalArg);
                _fac.CheckXsltType(invokeArg);

                if (!invokeType.IsSubtypeOf(formalType))
                {
                    // This may occur only if inferred type of invokeArg is XslFlags.None
                    Debug.Assert(invokeType == T.ItemS, "Actual argument type is not a subtype of formal argument type");
                    invokeArg = _fac.TypeAssert(invokeArg, formalType);
                }

                _invokeArgs.Add(invokeArg);
            }