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While developing your first web service in this chapter, you learned that WSDL is an XML vocabulary that describes the web service in terms of web methods exposed, their parameters, data types, and return values. Though you will rarely modify or construct WSDL yourself (at least when you are using Visual Studio), it is helpful to understand the internal structure of the WSDL document. This way, your understanding of the web service metadata will broaden. You will also find the knowledge of WSDL useful while learning Windows Communication Foundation services, which are covered in 12. Let s see the WSDL of a simple Hello World web service that we created initially in this chapter. We will be using this web service only as a sample. The discussion that follows is applicable to any other WSDL document also. The WSDL of the preceding web service is shown in Listing 9-24.

The tag s TLD entry follows:

txtFirst txtSecond optOption optOption (using the same name groups the radio buttons) btnSubmit txtResult

<tag> <name>href</name> <tagclass>com.portalbook.forums.tags.HrefTag</tagclass> <bodycontent>NONE</bodycontent> <info> Rewrite a relative URL so that it refers to the position in the page relative to the portlet (this will remove any path information donated by the portal to manage the portlet's state). </info> <attribute> <name>path</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag>

Listing 9-24. A Sample WSDL Document < xml version="1.0" encoding="utf-8" > <wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:tns="http://tempuri.org/" xmlns:s="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" targetNamespace="http://tempuri.org/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"> <wsdl:types> <s:schema elementFormDefault="qualified" targetNamespace="http://tempuri.org/"> <s:element name="HelloWorld"> <s:complexType /> </s:element> <s:element name="HelloWorldResponse"> <s:complexType> <s:sequence> <s:element minOccurs="0" maxOccurs="1" name="HelloWorldResult" type="s:string" /> </s:sequence> </s:complexType> </s:element> </s:schema> </wsdl:types> <wsdl:message name="HelloWorldSoapIn"> <wsdl:part name="parameters" element="tns:HelloWorld" /> </wsdl:message> <wsdl:message name="HelloWorldSoapOut"> <wsdl:part name="parameters" element="tns:HelloWorldResponse" /> </wsdl:message> <wsdl:portType name="ServiceSoap"> <wsdl:operation name="HelloWorld"> <wsdl:input message="tns:HelloWorldSoapIn" /> <wsdl:output message="tns:HelloWorldSoapOut" /> </wsdl:operation> </wsdl:portType>

If you aren t familiar with HTML forms code, a few things may seem a little quirky, particularly when dealing with the radio buttons. To create a group of radio buttons where only one is selectable, use the name property and set each one to the same value. So, as you can see in Listing 3-3, each radio button is called optOperation. You distinguish them from each other using the value property. In this listing, you can see that they contain the values Add and Subtract, respectively.

13

<wsdl:binding name="ServiceSoap" type="tns:ServiceSoap"> <soap:binding transport="http://schemas.xmlsoap.org/soap/http" /> <wsdl:operation name="HelloWorld"> <soap:operation soapAction="http://tempuri.org/HelloWorld" style="document" /> <wsdl:input> <soap:body use="literal" /> </wsdl:input> <wsdl:output> <soap:body use="literal" /> </wsdl:output> </wsdl:operation> </wsdl:binding> <wsdl:binding name="ServiceSoap12" type="tns:ServiceSoap"> <soap12:binding transport="http://schemas.xmlsoap.org/soap/http" /> <wsdl:operation name="HelloWorld"> <soap12:operation soapAction="http://tempuri.org/HelloWorld" style="document" /> <wsdl:input> <soap12:body use="literal" /> </wsdl:input> <wsdl:output> <soap12:body use="literal" /> </wsdl:output> </wsdl:operation> </wsdl:binding> <wsdl:service name="Service"> <wsdl:port name="ServiceSoap" binding="tns:ServiceSoap"> <soap:address location="http://localhost:2230/WebApplication3/Service.asmx" /> </wsdl:port> <wsdl:port name="ServiceSoap12" binding="tns:ServiceSoap12"> <soap12:address location="http://localhost:2230/WebApplication3/Service.asmx" /> </wsdl:port> </wsdl:service> </wsdl:definitions> If you observe the WSDL markup in Listing 9-24, you can identify six parts of the document. These six parts are the core elements of any WSDL document and are listed in Table 9-3.

Note that we have flagged that the tag requires the path field (there s no point using the tag without specifying a path to rewrite), that it does not process any body content, and that it should permit the evaluation of runtime expressions for the path attribute, allowing the following sort of invocation:

<%@ Page Language="C#" AutoEventWireup="true" Inherits="_Default" %> CodeFile="Default.aspx.cs"

This last point is essential, since we are adapting an existing application, which may well generate paths for resources at runtime. By permitting runtime evaluation of the path attribute, we enable the generated path to be used directly.

The <wsdl:types> element encloses all the type definitions from the web service. A message is the XML data that is being carried between the web service and its client. The <wsdl:message> element represents this message. The <wsdl:portType> section contains a list of operations (web methods) exposed by the web service. A binding is the protocol and format used by the port. It is represented by the <wsdl:binding> markup tag. A port is an endpoint of web service communication. It is represented by the <wsdl:port> markup tag. A service is the collection of one or more ports. It is represented by the <wsdl:service> markup tag.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> First Number       <input name="txtFirst" type="text" />

The Link-Building Tag (url)