No error messages when parsing ISO-EBNF

[MichaelHoffmeisterFesto]

Hello,

thank you very much for providing your tool. I use it in international standardization.

I am trying to parse ISO-EBNF. The parsing very often stops with no error messages, e.g. open rules, no delimiters or such. This means, that basically the user has to test out line by line, if the parser still works. This could be very tedious.

Best
Michael

Here an example with wrong quotes.

InterfaceOperation = OperationVerb, ModelElementName, { Modifier }, [ "By", ByQualifier ] ;
OperationVerb = "Get" | "GetAll" | "Put" | "Post" | "Patch" | "Delete" | "Invoke" ;
ModelElementName = ( ( "AssetAdministrationShell" | "SubmodelReference" ), ["s"] ) | "AssetInformation" | "Submodel" | ("SubmodelElement", ["s"] ) | "Operation" | “Thumbnail” ;