XQuery functions returning multiple element types

[Michael Kay]

> 
> I'm trying to declare a function that can return 2 element 
> types but with no success.  Maybe its not possible.

If foo and bar are sufficiently related to be alternative results of the
function, then perhaps they should be members of a substitution group, in
which case you can say $root as schema-element(s) where s is the name of the
substitution group.

This becomes easier in XSD 1.1 where elements can belong to more than one
substitution group.
> 
> What I'd like to do is something like this  (simplified)
> 
> 
> declare function  search( $root as element(root) )  as 
> element(foo|bar)* {

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay