mule请求webservice怎么传递多个参数

Question

我的一段mule配置：<flow name="in_innosoft_orm_validatorService" doc:name="innosoft_orm_validatorService">
<http:inbound-endpoint exchange-pattern="request-response" host="192.168.1.209" port="${port1}" path="innosoft/orm/validatorService" doc:name="HTTP Endpoint"/>
<http:body-to-parameter-map-transformer doc:name="Body to Parameter Map"/>
<flow-ref name="out_innosoft_orm_validatorService_login" doc:name=""/>
</flow>
<sub-flow name="out_innosoft_orm_validatorService_login" doc:name="out_innosoft_orm_validatorService_login">
<set-payload value="#[payload['userAcct'],payload['userPwd']]" doc:name="userAcct"/>
<outbound-endpoint exchange-pattern="request-response" address="wsdl-cxf:http://192.168.1.209:8080/orm/services/innosoft/orm/validatorService?wsdl&amp;method=login" doc:name=""/>
</sub-flow>
我有两个参数，一个userAcct,一个是userPwd。使用set-payload好像只能传递一个。要怎么才能传递两个呢？谢谢。