You already made it far beyond what I ever achieved. I aimed at a XML-based file format description and that gets messy pretty quickly once you have to express

You already made it far beyond what I ever achieved. I aimed at a XML-based file format description and that gets messy pretty quickly once you have to express expressions. After the initial friction of having to write a parser, going with a custom language seems way more promising. I always wanted to peek under the hood of Wireshark and see how they do it - do they have specialized code for every protocol or do they use an abstract protocol description, too? I never did it. I hope your project matures, there is a lot of space in this niche.