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Unicode (as of June this year) is at version 9.0. Section A.1 still lists the 6.0 version, which is from 2010 (!). The text links to the versions page, which is a general page on versioning. I suggest we include a link to the "Latest version" instead (or in addition), which more reliably and unambiguously points to the latest version: http://www.unicode.org/versions/latest. This bug also applies to XSLT30, except that we don't explicitly mention a version number there.
I have updated the reference.