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.
If
an element node is annotated as xs:untyped, all of
its descendant element nodes are also annotated as xs:untyped