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In sections 2.1, 2.2.1, 2.3, and E.1 all occurrences of the word "RangeExpr" (and in 2.1, one erroneous occurrence of "RangeExp") should be changed to "StringConcatExpr". (The element name xqxft:ftRangeExpr can stay as is, it'll just be a bit confusing.)
This bug is now fixed in the members-only version of the document. Since I submitted the bug, I'm marking it Resolved-Fixed.