Mihaela Mihaljevic 2a9a5afaa9 fix(schema): a non-nillable element must carry no xsi:nil at all (cvc-elt.3.1) ... cvc-elt.3.1: when an element's declaration is not nillable, the xsi:nil attribute is forbidden entirely, whatever its value. PureXML only rejected xsi:nil="true" on a non-nillable element, so xsi:nil="false" slipped through. ComplexValidator.nilErrors now flags the presence of any xsi:nil on a non-nillable element via the new nilAttributeValue helper, while a nillable element still accepts xsi:nil="false" (explicitly not nilled, valid empty-or-content per its type). XSTS invalid-instances-accepted 28 -> 26 (both xsi:nil-on-non-nillable cases), no other bucket moved (valid-schemas-rejected and valid-instances-rejected held at 0 across all 14383 groups). 1452 unit tests pass.		2026-06-20 03:22:05 +02:00
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2026-06-18-false-negative-tail.md	fix(schema): a non-nillable element must carry no xsi:nil at all (cvc-elt.3.1)	2026-06-20 03:22:05 +02:00