how to set a PreparedStatement column of XML type in 8.3?

I'm using the 8.3dev-602 JDBC driver, trying to set the value of an "xml"
type column in an 8.3 database. The driver keeps throwing exceptions like

ERROR: column "xml" is of type xml but expression is of type character
varying

I've tried a variety of different ways, including pstmt.setString,
pstmt.setObject, and pstmt.setObject passing in Types.OTHER.

What is the correct way to set a statement parameter value for an xml column?

Thanks,
m@