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What changed in each e-invoicing rule release, and how xmlvalid validates XML: libxml2, WebAssembly, Schematron and the bugs we found on the way

Validating a 5 GB XML file in the browser libxml2 compiled to WebAssembly, fed from a File one megabyte at a time: a 5 GB document checked against its XSD in 66 seconds, nothing uploaded, memory flat

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