functx XQuery module
The popular "functx" XQuery module is built into xmlsh.
FunctX Module
To access this module you must import it but do not need to give a location hint ("at").
e.g.
import module namespace functx = 'http://www.functx.com' ;
For example, the xtype command is implemented in part with this script
xquery -n -q <{{
import module namespace functx = 'http://www.functx.com' ;
declare variable $A external ;
functx:sequence-type($A)
}}> -v A {$var}