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some questions about the wsdl snippet

wupeng Thu, 10 Aug 2006 00:12:52 -0700

<?xml version="1.0" encoding="UTF-8"?>

<definitions name="WeatherService"
   targetNamespace="http://www.ecerami.com/wsdl/WeatherService.wsdl"
   xmlns="http://schemas.xmlsoap.org/wsdl/"
   xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
   xmlns:tns="http://www.ecerami.com/wsdl/WeatherService.wsdl"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema">

   <message name="getWeatherRequest">
      <part name="zipcode" type="xsd:string"/>
   </message>
   <message name="getWeatherResponse">
      <part name="temperature" type="xsd:int"/>
   </message>

   <portType name="Weather_PortType">
      <operation name="getWeather">
         <input message="tns:getWeatherRequest"/>
         <output message="tns:getWeatherResponse"/>
      </operation>
   </portType>

   <binding name="Weather_Binding" type="tns:Weather_PortType">
      <soap:binding style="rpc"
         transport="http://schemas.xmlsoap.org/soap/http"/>
      <operation name="getWeather">
         <soap:operation soapAction=""/>
         <input>
            <soap:body
               encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
               namespace="urn:examples:weatherservice"
               use="encoded"/>
         </input>
         <output>
            <soap:body
               encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
               namespace="urn:examples:weatherservice"
               use="encoded"/>
         </output>
      </operation>
   </binding>

   <service name="Weather_Service">
      <documentation>WSDL File for Weather Service</documentation>
      <port binding="tns:Weather_Binding" name="Weather_Port">
         <soap:address
            location="http://localhost:8080/soap/servlet/rpcrouter"/>
      </port>
   </service>
</definitions>
1. targetNamespace="http://www.ecerami.com/wsdl/WeatherService.wsdl"

is this for the definition of namespace of the file?
if yes,why are we need that xmlns:tns="http://www.ecerami.com/wsdl/WeatherService.wsdl"?what's the effection of "tns"?

2.xmlns:xsd="http://www.w3.org/2001/XMLSchema"
who verify the URI ?the parser of xml written by java?And when i should write 2001 or 1999 in the URI?

3.encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
why should we write like this?shall we definit in the beginnig of the file?is there a parser to parse the sentence?what's the results?