internal IfConditionClauseSyntax(TextExtent extent, IdentifierOrStringSyntax identifierOrString) : base(extent) {
     AddChildNode(_identifierOrString = identifierOrString);
 }
 internal CodeUsingDeclarationSyntax(TextExtent extent, IdentifierOrStringSyntax namespaceSyntax) : base(extent) {
     AddChildNode(_namespace = namespaceSyntax);
 }