fn.compare( $comparand1 as String?, $comparand2 as String?, [$collation as String] ) as Number?
Returns -1, 0, or 1, depending on whether the value of the $comparand1 is respectively less than, equal to, or greater than the value of $comparand2, according to the rules of the collation that is used.
|$comparand1||A string to be compared.|
|$comparand2||A string to be compared.|
|$collation||The optional name of a valid collation URI. For information on the collation URI syntax, see the Search Developer's Guide.|
fn.compare("hello", "goodbye") => 1