Webservice problem

[N. Ganapathy]

I am facing problem while giving input to the webservice through servlet. the below code shows some of the variable for which we pass the input . i can't pass input to the variable "Engine" which has datatype ENGINETYPE


@XmlElement(name = "Engine", required = true)
protected EngineType engine;
@XmlElement(name = "Layout")
protected String layout;

how to give input to the variable which is set as protected. please help me out with the above datatype "ENGINETYPE" and the variable is "engine".
the other variable which has datatype String can be given input. This code is in webservice. please help me out to pass the input to the variable "Engine".

Thanks in Advance