soap webservice anytype in xml

i am using soapwebservice. i have a generic class whose attribute in xsd is <xs:element name="id" type="xs:anyType" minOccurs="0"/> How will i pass value to this attribute through soap UI. i am using in xml <id>amar</id> which is not working properly. i am getting value null in java object populated by jaxb. Where am i going wrong. I want it unmarshalled as a string type. Any help is appreciated. I searched and found link in stackoverflow. but even it does not give a clear insight into how to use in xml.