Validation

validate(&doc) checks a document on its own:

• phase rules from the official schema profile: elements the phase does not carry, required elements that are missing (3.2 and 3.3 only);
• identifiers: duplicated ID, dangling IDRef;
• Ordnungszahlen: the RNoPart pattern, 14 characters at most, unique and ascending in the standard’s sort order;
• decimals: Qty and UP with at most three places, IT and VAT with two;
• arithmetic: IT = round2(Qty × UP), category totals against their items, the bill total against its categories;
• X84: no unit price on a not-offered item.

validate_against_tender(&bid, &tender) checks a bid against the tender it answers: the same categories, the same items, quantities unchanged unless the tender left them open. Items are matched by ID and, failing that, by Ordnungszahl; a changed ID is a warning.

Findings carry a severity, a code, the Ordnungszahl where there is one and a message. The CLI exits 1 when any finding is an error.