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Articles
Factur-X: The Technical Reference (XML, Profiles, EN 16931 Mapping)
A complete developer reference for Factur-X — the hybrid PDF/A-3 + CII XML format used across France, Germany, and Luxembourg. XML anatomy, profile hierarchy, EN 16931 rule mapping, validation errors, and code samples.
EN 16931 Validation: The Complete Rule Map (955 Rules Explained)
Every EN 16931 validation rule categorized, explained, and cross-referenced. The definitive technical reference for e-invoice developers.
E-Invoice Schematron Rules Explained: What ERP Developers Need to Know
A practical guide to Schematron validation in EU e-invoicing. Understand the three validation layers, read real rule examples, debug common errors, and see how EN16931, Peppol, and country-specific rules work together.