Safe DOCX posture
Custom XML deletion range start
w:customXmlDelRangeStart has the same preservation-only boundary as its end
marker; balanced IDs are validated without interpreting deletion semantics.
ECMA-376 edition 5, Part 1 § 17.13.5.5
Custom XML deletion range start
Product posture and evidence for this normative section. The ECMA publication is the authority; this page reports only the pinned Safe DOCX projection.