Licences and rule versions
Every rule set, schema and processor used by this site, with its version and licence. The rule files are used unmodified (compiled to SaxonJS format).
| Component | Version | Licence | Source |
|---|---|---|---|
| EN 16931 validation artefacts (UBL 2.1) | 1.3.16 | EUPL-1.2 | github.com/ConnectingEurope/eInvoicing-EN16931 |
| EN 16931 validation artefacts (UN/CEFACT CII D16B) | 1.3.16 | EUPL-1.2 | github.com/ConnectingEurope/eInvoicing-EN16931 |
| XRechnung 3.0.2 Schematron (CIUS + Extension) | 2.6.0 | Apache-2.0 | github.com/itplr-kosit/xrechnung-schematron |
| Peppol BIS Billing 3.0 rules | 3.0.21 | LicenseRef-OpenPeppol (no SPDX licence; see LICENSES.md) | github.com/OpenPEPPOL/peppol-bis-invoice-3 |
| UBL 2.1 (OASIS) and UN/CEFACT CII D16B XML Schemas, as packaged by the KoSIT XRechnung validator configuration | xrechnung-3.0.2-validator-configuration-2026-08-31 | OASIS-IPR (UBL XSD), UN/CEFACT free use (CII XSD), Apache-2.0 (KoSIT packaging) | github.com/itplr-kosit/validator-configuration-xrechnung |
| SchXslt (Schematron → XSLT compiler, build-time only) | 1.10.1 | MIT | doi.org/10.5281/zenodo.1495494 |
| SaxonJS 2.7 browser runtime (SaxonJS2.rt.js) | 2.7 | LicenseRef-Saxonica-SaxonJS-1.0 (free, redistributable in binary form inside an application) | www.saxonica.com/saxonjs/ |
| pdf-lib (PDF attachment extraction) | 1.17.1 | MIT | github.com/Hopding/pdf-lib |
| xmllint-wasm (libxml2, XML Schema validation) | 5.3.0 | MIT | github.com/noppa/xmllint-wasm |
| Tabler Icons | 3.50.0 | MIT | tabler.io/icons |
| IBM Plex Sans / Mono | Google Fonts | OFL-1.1 | github.com/IBM/plex |
| Next.js / React | 16.4.3 / 19.3.0 | MIT | nextjs.org |
EN 16931 validation artefacts © CEN/TC 434 / European Commission, licensed under the EUPL-1.2. The Schematron sources are available at github.com/ConnectingEurope/eInvoicing-EN16931; this site uses the published XSLT unmodified, compiled to SaxonJS SEF format.
XRechnung Schematron, validator configuration and test suite © KoSIT, Apache License 2.0. OpenPeppol BIS Billing 3.0 rules are not included (no open licence).
SaxonJS 2.7 runtime © Saxonica Ltd. Redistributed in binary form, unmodified, under the SaxonJS licence: LICENSE.txt. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES ARE DISCLAIMED.