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Factur-X/ZUGFeRD e-invoice validation requires XSD and Schematron checks

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France will mandate B2B e-invoicing from September 2026, followed by Germany in January 2027. Both countries use hybrid PDF/XML formats based on the European EN 16931 standard. Validating these invoices requires three steps: extracting the XML from the PDF, checking it against an XSD for structure, and verifying it against Schematron business rules. Skipping the Schematron validation can result in invoices that are technically valid but non-compliant with the standard. The author has built a free, public validator tool to address a lack of accessible testing options.

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