WEB SERIVCE调用问题

现在调用需要传入四个值，现在就是groupAttr不知道怎么传值，
call.addParameter(new QName(soapaction, "recordSequenceId"), // 设置要传递的参数
org.apache.axis.encoding.XMLType.XSD_STRING,
javax.xml.rpc.ParameterMode.IN); call.addParameter(new QName(soapaction, "groupType"), // 设置要传递的参数
org.apache.axis.encoding.XMLType.XSD_STRING,
javax.xml.rpc.ParameterMode.IN); call.addParameter(new QName(soapaction, "groupId"), // 设置要传递的参数
org.apache.axis.encoding.XMLType.XSD_STRING,
javax.xml.rpc.ParameterMode.IN); call.addParameter(new QName(soapaction, "groupAttr"), // 设置要传递的参数
org.apache.axis.encoding.XMLType.XSD_ENTITY,
javax.xml.rpc.ParameterMode.IN);
需要调用的WEB SERVICE格式如下：
<q1:syncGroupRelationRequest>
  <q0:recordSequenceId>111111111</q0:recordSequenceId>
  <q0:groupType>1111111111</q0:groupType>
  <q0:groupId>11111</q0:groupId>
  <q0:groupAttr>
    <q1:item>
      <q2:groupMemId>1111111111</q2:groupMemId>
      <q2:mdn>11111111</q2:mdn>
      <q2:userServiceType>111111111</q2:userServiceType>
      <q2:memRole>1111111</q2:memRole>
      <q2:operationType>1111111</q2:operationType>
      <q2:reserve>11111111111</q2:reserve>
    </q1:item>
    <q1:item>
      <q2:groupMemId>12</q2:groupMemId>
      <q2:mdn>22</q2:mdn>
      <q2:userServiceType>22</q2:userServiceType>
      <q2:memRole>22</q2:memRole>
      <q2:operationType>22</q2:operationType>
      <q2:reserve>222</q2:reserve>
    </q1:item>
  </q0:groupAttr>
</q1:syncGroupRelationRequest>