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(reported by Dimitre Novachev on xsl-list) Two examples of format-number() using scientific notation - a new feature in 3.1 - appear to have accidentally found their way into the 3.0 recommendation. It's worth checking the CVS change history to check that no other edits have been misapplied in the same way.
The error affects 3.0 only. It has been noted in the draft errata maintained by the editor (in changes.txt), and the bug is therefore being marked as resolved and closed.