The generic xs:untypedAtomic
type applies to all attribute nodes and atomic values that are "untyped," i.e., have no specific type. An attribute node is untyped if it was not validated against a schema declaration. "Types, Nodes, and Atomic Values" in Chapter 11 describes how attribute nodes might come to be untyped.
An atomic value might have the type xs:untypedAtomic
if it was extracted from an untyped element or attribute. Untyped atomic values can often be used wherever a typed value would. This is because every function and expression has rules for casting untyped values to an appropriate type.
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