Xpath查询数组的问题

在wsdl里这样定义的： <xsd:complexType name="ArrayOf_xsd_string2">
    <xsd:complexContent>
     <xsd:restriction base="soapenc:Array" >
      <xsd:attribute ref="soapenc:arrayType"  wsdl:arrayType="xsd:string[]"/>
     </xsd:restriction>
    </xsd:complexContent>
 </xsd:complexType><wsdl:message name="Request">
<wsdl:part name="logisticsform" type="impl：ArrayOf_xsd_string2"/>
</wsdl:message>请问怎么用XPath得到数组的数据