| SAXONICA |
The rules for effective boolean value have changed.
These rules make it a type error to ask for the effective boolean value of
anything other than a sequence starting with a node, or a singleton boolean, number, or string.
For example, testing the effective boolean value of an xs:anyURI value or
of a sequence of integers is now an error.
Similarly, it is now an error for the value of a predicate in a filter expression to evaluate to anything other than a sequence starting with a node, or a singleton boolean, number, or string.
