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PN Invoice 0.1.0
First release: EN 16931 invoice and credit note model, UBL 2.1 and CII D16B writers, layered validation (XML safety, bundled XSDs, 104 EN 16931 business rules in pure PHP, optional Schematron adapter), and a CLI. The business rules cover a documented subset of EN 16931; see README. Not legal or tax advice.