XQuery 3.0 implementation

Support for XQuery 1.0 and XQuery 3.0 is dropped (that is, there is no longer any way to run Saxon as an XQuery 1.0 or XQuery 3.0 processor, in such a way that later language features are rejected). XQuery 1.0 and 3.0 queries will continue to run, because there is a high level of backwards compatibility in XQuery 3.1.