How invoice rule guides are evidenced
Each guide separates a primary-source assertion from a reproduced engine result. EN 16931 1.3.16 uses its UBL or CII artefacts. XRechnung adds national rules 2.6.0 for XRechnung 3.0.2. Factur-X 1.09.2 provides profile-specific CII checks. A passing rule is not certification or recipient acceptance. Complete Peppol transport and national French CTC rules are outside this service.
The corpus contains 1,338 synthetic field mutations, not visitor invoices. For each code, runs count documents containing that code once, regardless of repeated diagnostics. Co-occurrence counts other distinct codes in those same runs. Counts overlap and are not error probabilities or observed customer frequencies. The displayed list shows the first twelve co-occurring codes; the downloadable evidence contains every code and count. A zero count for a later Factur-X-specific code means it was absent from this older corpus, not that its rule never fails.
Unique words are word occurrences in literal sentences found on only one guide in the same language/group. The build excludes preformatted code, scripts and styles, and includes visible navigation and footer text. Shared sentences occur on at least two pages, including noindex guides. Indexable guides need at least 180 unique words and no more than 40 percent shared sentences. Insufficient guides remain linked for diagnosis with noindex and are omitted from the sitemap.
Primary rule files retain their EUPL 1.2, Apache and Factur-X notices. No CEN standard publication is reproduced here.
EN / XRechnung sources · Factur-X NOTICES · KSeF NOTICES
Build evidence: per-page measurements and all co-occurrence counts