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[Affects XQuery11 too.] 2 "Basics", para 1: "The basic building block of XPath 2.1 is the expression, which is a string of [Unicode] characters (the version of Unicode to be used is implementation-defined.)" Change characters (the version to characters. (The version And maybe drop the parentheses.
I decided on a semicolon: The basic building block of XPath 3.0 is the expression, which is a string of [Unicode] characters; the version of Unicode to be used is implementation-defined.