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          To learn web service, we need to learn WSDL. This xml file defines the services that we deploy in our web service.
          
Here, we get  a  example of WSDL.
          

          

          <?xml version="1.0" encoding="UTF-8"?>
          
          <wsdl:definitions targetNamespace="http://localhost:8080/bookstore/services/BookSvc" 
          
  xmlns          ="http://schemas.xmlsoap.org/wsdl/" 
          
  xmlns:apachesoap          ="http://xml.apache.org/xml-soap" 
          
  xmlns:impl          ="http://localhost:8080/bookstore/services/BookSvc" 
          
  xmlns:intf          ="http://localhost:8080/bookstore/services/BookSvc" 
          
  xmlns:soapenc          ="http://schemas.xmlsoap.org/soap/encoding/" 
          
  xmlns:tns1          ="http://model.bookstore.com" 
          
  xmlns:wsdl          ="http://schemas.xmlsoap.org/wsdl/" 
          
  xmlns:wsdlsoap          ="http://schemas.xmlsoap.org/wsdl/soap/" 
          
  xmlns:xsd          ="http://www.w3.org/2001/XMLSchema">
          
            <wsdl:types>
          
              <schema targetNamespace="http://model.bookstore.com" xmlns="http://www.w3.org/2001/XMLSchema">
          
                <import namespace="http://schemas.xmlsoap.org/soap/encoding/"/>
          
                <complexType name="Book">
          
                  <sequence>
          
                    <element name="ISDN" nillable="true" type="xsd:string"/>
          
                    <element name="name" nillable="true" type="xsd:string"/>
          
                    <element name="page" type="xsd:int"/>
          
                  </sequence>
          
                </complexType>
          
              </Schema>
          
            </wsdl:types>
          
            <wsdl:message name="addBookResponse">
          
            </wsdl:message>
          
            <wsdl:message name="addBookRequest">
          
              <wsdl:part name="book" type="tns1:Book"/>
          
            </wsdl:message>
          
            <wsdl:portType name="BookSvc">
          
              <wsdl:operation name="addBook" parameterOrder="book">
          
                <wsdl:input message="intf:addBookRequest" name="addBookRequest"/>
          
                <wsdl:output message="intf:addBookResponse" name="addBookResponse"/>
          
              </wsdl:operation>
          
            </wsdl:portType>
          
            <wsdl:binding name="BookSvcSoapBinding" type="intf:BookSvc">
          
              <wsdlsoap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
          
              <wsdl:operation name="addBook">
          
                <wsdlsoap:operation soapAction=""/>
          
                <wsdl:input name="addBookRequest">
          
                  <wsdlsoap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://bookstore.com" use="encoded"/>
          
                </wsdl:input>
          
                <wsdl:output name="addBookResponse">
          
                  <wsdlsoap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://localhost:8080/bookstore/services/BookSvc" use="encoded"/>
          
                </wsdl:output>
          
              </wsdl:operation>
          
            </wsdl:binding>
          
            <wsdl:service name="BookSvcService">
          
              <wsdl:port binding="intf:BookSvcSoapBinding" name="BookSvc">
          
                <wsdlsoap:address location="http://localhost:8080/bookstore/services/BookSvc"/>
          
              </wsdl:port>
          
            </wsdl:service>
          
          </wsdl:definitions>
          
 So many infomations in this file. But first of all, we need to understand the format of this file. 
          
To me, the defination of namespace is a problem.
          

          
My qustions are: For xmlns, xmlns:tns1,xmlns:intf..., What do they mean? How to use them?
          

          

          
After I refered to some articles in internet. I get the answer:
          
每個namespace屬性都聲明了一個縮略語，用在文檔中。例如"xmlns:xsd"就為 

          
But I get another question that no one reply.
          
refer
          

          '我們都知道，WSDL應該是格式正確的XML文檔。進一步，還應該把它看作一個Schema，因此，<definitions>元素中可以定義targetNamespace屬性，表示在這個元素下的所有元素都屬于這個目標名稱空間。
          

          xmlns表示缺省的名稱空間，...'
          

          

          
So what's difference between 'targetnamespace' and default 'xmlns'?
          
?????????????????????????????????????????????????????????
          

          
Reference:
          
http://www.cnblogs.com/bjzhanghao/archive/2004/10/13/51614.html 

	          

          







          
	    
    




          





          


          

	
          
		
          
				
		
	
		
          
		
		
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