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The last bullet in section 17.1.2 "Casting to xs:string and xdt:untypedAtomic" of the F&O spec is "In all other cases, TV is the [XML Schema Part 2: Datatypes Second Edition] canonical representation of SV. For datatypes that do not have a canonical lexical representation defined an implementation dependent canonical representation may be used." There should be a reference to the canonical representations of xdt:yearMonthDuration and xdt:dayTimeDuration in this (or another) bullet. Joanne [on behalf of XTTF]
Closing bug because commenter has not objected to the resolution posted and more than two weeks have passed.