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The description of the instance of the data model in appendix E indicates that the result of dm:type-name for some nodes is xdt:untypedAtomic and that dm:typed-value for some nodes is a value of type xdt:untypedAtomic. Those should be xs:untypedAtomic rather than xdt:untypedAtomic, of course.
Yes they should indeed - will be covered by Erratum E008