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The XSD builtin datatypes, gMonthDay and time, are missing from the sentence "This appendix also addresses the additions of durations to the datatypes ......". Since Section 3.2.12 gMonthDay and Section 3.2.8 time contain a reference to Appendix E, one would conclude they should also be listed in this sentence to confirm that the add duration algorithm also applies to these two types. For more details, see: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2004JanMar/0038.html
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2004JanMar/0039.html
Marking this 1.0 only: The appendix in question no longer exists in 1.1.