The WebParam annotation type elements : Web Services Annotations « Web Services SOA « Java Tutorial

nameThe name of the parameter
partNameThe name of the wsdl:part of this parameter.
targetNamespaceSpecifies the namespace for this parameter.
modeThe direction in which the parameter is flowing. The value can be IN, OUT, or INOUT.
headerIndicates whether or not the parameter is retrieved from a message header and not from the message body.

26.3.Web Services Annotations
26.3.1.The WebService annotation type elements
26.3.2.The WebMethod annotation type elements
26.3.3.The WebParam annotation type elements
26.3.4.The WebResult annotation type elements
26.3.5.Annotations Found in the javax.xml.bind.annotation Package
26.3.6.Create a simple Web Service
26.3.7.Developing Web Services Using JAX-WS