I never worked with Jersey, but I suppose it's similar to RESTlet.
You need definitions of the WebService, something to explain to you how to do calls to it, how to pass parameters, and what it will return to you. If it was SOAP you'd have a WSDL with everything you need, for REST you rely on what WebService provider wanna give you.
For REST you'll probably have something like "GET
http://domain/path/operation/term/code" and you'll receive a XML with the output.
Another possibility, not recommended in REST, would be "GET
http://domain/path/operation" and pass term and code as post parameters.
As I said, you're asking how to pass term and code parameters, so you must ask WebService provider for definitions on how to pass them.