Data types for untyped data

The xs:untyped and xs:untypedAtomic data types support untyped data.

xs:untyped
The data type xs:untyped serves as a special type annotation to indicate types that have not been validated by an XML schema or a DTD. The data type xs:untyped can be used (for example, in a function signature) to define a required type to indicate that only an untyped value is acceptable. The base type of xs:untyped is xs:anyType.
xs:untypedAtomic
The data type xs:untypedAtomic serves as a special type annotation to indicate atomic values that have not been validated by an XML schema or a DTD.

Parent topic: XQuery type system