2.1.341 Part 4 Section 2.13.5.20, ins (Inserted Run Content)
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For additional notes that apply to this portion of the standard, please see the notes for customXml, §2.5.1.5(a); comment, §2.13.4.2(b, c); cellDel, §2.13.5.1(a); oMathPara, §7.1.2.78(a).
a. The standard allows nested insertions.
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Word does not support nested insertions.
b. The standard states that the author attribute is required, but the prose defines its behaviour when omitted.
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Word behaves according to schema - the author attribute is required.