Hi, since Hans often refers to bad and changing “standards” (e.g. PDF, MathML, ePub…) and Taco told us about the mess of RTF: You’re not alone. There’s the ONIX[1] XML standard for publication data, prominently used by the monopolist VLB (Verzeichnis lieferbarer Bücher, German catalogue of books in print). A friend and I had the idea of an open book catalogue (for all publishers and bookshops that want to participate), and they’re setting up a proof of concept. Just got a message: * The examples from the ONIX homepage have errors if you check against their “strict” schemas. * The catalogue of our publishing house, exported as ONIX from VLB, has errors when checked against the “not strict” schema, i.e. VLB generates faulty data. Beautiful standards… Hraban [1] https://www.editeur.org/83/Overview/