Safe DOCX posture
w:numId numbering instance reference
List paragraphs reference their instance via w:numId inside w:numPr.
Generation and paragraph mutation validate that the instance exists before
emitting or changing document XML.
ECMA-376 edition 5, Part 1 § 17.9.18
w:numId numbering instance reference
Product posture and evidence for this normative section. The ECMA publication is the authority; this page reports only the pinned Safe DOCX projection.