public override bool VisitTopLevelUsingNamespace([NotNull] GamaParser.TopLevelUsingNamespaceContext context) { var ns = GlobalContext.GetNamespaceChain(context.fqtn().Symbol().Select(s => s.GetText()).ToArray()); if (ns == null) { GlobalContext.AddError(new ErrorUsingNamespaceNotFound(context.fqtn())); return(false); } NamespaceContext.AddImport(ns); return(true); }