Implementation of selected features from the draft XQuery 1.1 specification has started, but is not very far advanced. Note that this specification is at an early stage of development and subject to change - Saxon's implementation will change as the spec changes. Note also that there is no commitment to produce a complete implementation of XQuery 1.1.
This support is available only in Saxon-EE. It requires XQuery 1.1 to be enabled both at the level of the API or command line (-qversion:1.1), and in the Query prolog. It cannot be used at the same time as XQuery Updates.