2.1.223 Part 1 Section 17.6.18, sectPr (Section Properties)
a. The standard appears to have the same definition for rsidSect as it does for rsidRPr.
Word uses rsidSect to denote the editing session when the section properties were last modified.
b. The standard states that rsids are stored on the section properties, distinct from the paragraph in which they are located.
Word ignores rsids in the sectPr and instead applies the corresponding rsids from the containing p (for the sectPr of any non-final section) or the last p in the document (for the final section).
c. The standard states that a sectPr element can be contained within any pPr element.
Word does not allow this element to be used on paragraphs within tables, headers, footers, comments, footnotes, endnotes, or text boxes.