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Pure-Elixir Factur-X / ZUGFeRD e-invoicing: generate and extract hybrid PDF/A-3 + CII XML invoices (EN 16931), with optional Schematron validation.

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priv/schematron/NOTICE.md

# Bundled Schematron (third-party)
The compiled Schematron XSLT and code-list databases under this directory are
**not** part of facturx's own code. They are redistributed for use by
`Facturx.Validate`.
- `en16931/Factur-X_1.09_EN16931.xsl` and `en16931/FACTUR-X_EN16931_codedb.xml`
originate from the Factur-X / EN 16931 standard, as packaged by the
[`akretion/factur-x`](https://github.com/akretion/factur-x) project.
Copyright (c) 2016-2023, Alexis de Lattre — BSD-3-Clause-style license
(see the akretion/factur-x repository for the full text). The underlying
Schematron is published by FNFE-MPE / the Factur-X standard.
The XSD schemas under `priv/xsd/en16931/` (`Factur-X_EN16931.xsd` and its three
imported UN/CEFACT schemas) share the same origin — the Factur-X / EN 16931
standard as packaged by `akretion/factur-x`.
These files are provided as-is; refer to the upstream projects for their terms.