İçeriğe atlaSchematron applies business rules to XML invoices beyond XSD structure checks.
XSD validates XML structure; Schematron validates business logic — e.g. BR-DE rules requiring VAT IDs, correct tax categories and mandatory fields for German e-invoices.
KoSIT publishes official Schematron rules for XRechnung. Tentaco runs these rules in the browser so you catch errors before portal submission.
