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Listing 4-2 The Example VB NET Web service with an RPC/encoded and a document/literal method (VBWSBook\4\Combos\Exampleasmxvb)
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Public Structure theStruct Public theName As String Public theNumber As Double Public theDate As Date End Structure
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Public Class Example <WebMethod(), SoapRpcMethod()> _ Public Function ExampleRpcEnc(ByVal a As Integer, _ ByVal b As Single(), _ ByVal c As theStruct) As Object Dim ret As Double = 999 Return ret End Function
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<WebMethod(), SoapDocumentMethod()> _ Public Function ExampleDocLit(ByVal a As Integer, _ ByVal b As Single(), _ ByVal c As theStruct) As Object Dim ret As Double = 999 Return ret End Function End Class
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As you learned in chapter 1, you can obtain the WSDL for a NET Web service by navigating to the service s asmx file and adding WSDL as a query string The next two sections show and explain the contents of this auto-generated WSDL beginning with the document/literal method
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Document/literal Listing 4-3 shows a modified version of the auto-generated WSDL for the ExampleDocLit method in Listing 4-2 The original auto-generated WSDL contains definitions for both methods ExampleDocLit and ExampleRpcEnc To make the WSDL easier to read, I separated the two definitions so that you can focus on each one individually In addition, I removed the <types> section and put it in a separate listing (Listing 4-4) also to make the core WSDL easier to read
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Listing 4-3 WSDL document for the document/literal combination Note that the <types> section has been removed to make the document easier to read (VBWSBook\4\ExampleWSDLs\DocLitExamplewsdl)
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<definitions xmlns:s="http://wwww3org/2001/XMLSchema" xmlns:soap="http://schemasxmlsoaporg/wsdl/soap/" xmlns:s1="http://tempuriorg/" targetNamespace="http://tempuriorg/" xmlns="http://schemasxmlsoaporg/wsdl/">
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<!-- <types> section removed from here -->
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<message name="ExampleDocLitSoapIn"> <part name="parameters" element="s1:ExampleDocLit" /> </message> <message name="ExampleDocLitSoapOut"> <part name="parameters" element="s1:ExampleDocLitResponse" /> </message> <portType name="ExampleSoap"> <operation name="ExampleDocLit"> <input message="s1:ExampleDocLitSoapIn" /> <output message="s1:ExampleDocLitSoapOut" /> </operation> </portType>
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<binding name="ExampleSoap" type="s1:ExampleSoap"> <soap:binding transport="http://schemasxmlsoaporg/soap/http" style="document" /> <operation name="ExampleDocLit"> <soap:operation soapAction="http://tempuriorg/ExampleDocLit" style="document" /> <input> <soap:body use="literal" /> </input> <output> <soap:body use="literal" /> </output> </operation> </binding> <service name="Example"> <port name="ExampleSoap" binding="s1:ExampleSoap"> <soap:address location="http://VBWSServer/vbwsbook/4/Combos/Exampleasmx" /> </port> </service> </definitions>
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The first thing you ll notice about Listing 4-3 is that each of the input and output messages contains only one <part> When you are using document style messages, the message content can be anything that you define This is because document style means you are sending and receiving documents with no implication of methods and method parameters In this example, NET defines two elements in the <types> section shown in: ExampleDocLit and ExampleDocLitResponse both belonging to the schema targetNamespace which is http://tempuriorg/ The first element, ExampleDocLit, represents the input to the method and contains three elements named a,b, and c Element b is of type ArrayOfFloat which is defined further down in the schema as having a sequence of elements called <float> with type xsd:float Similarly, the element c is of type theStruct which is also defined in the schema as having a sequence of three elements: theName, theNumber, theDate
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Essentially, when you use document/literal, NET defines an element with the same name as the method This element contains an element for each parameter of your method with the same name as the parameter NET also defines an XSD complex type for each parameter that has a non-primitive type such as arrays, structs, and classes These are just the rules that NET uses for defining the schema used with document/literal operations But there isn t one correct way of defining this schema, you can define any schema you like as long as it meets your needs For example, I can get rid of the ExampleDocLit element from the type definitions and re-write the input message to directly contain the three elements a, b, and c:
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<message name="ExampleDocLitSoapIn"> <part name="one" element="s1:a" /> <part name="two" element="s1:b" /> <part name="three" element="s1:c" /> </message>
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Note that I also used the names one, two, and three for the message parts When using document (as opposed to RPC), there are no restrictions on the part names because we aren t thinking in terms of method parameters we are just passing XML documents Going back to listing 4-3, you ll see ExampleDocLitResponse element declared with a complex type that contains one element called ExampleDocLitResult The interesting thing about this ExampleDocLitResult element is that it has no type attribute According to the XML Schema Part 1 recommendation, an element with a missing type attribute has the default type anyType You might remember from chapter 2 that anyType is at the root of the XSD type system: all XSD types derive (directly or indirectly) from anyType This makes anyType the equivalent of the SystemObject type in the NET type system, which is why the return value s type is anyType Also in listing 4-3, you ll see that the style attribute of the <soap:binding> element indicates that the default SOAP message style is document The <soap:operation> also has a style attribute which is also set to document in this case If the style attributes of <soap:binding> and <soap:operation> have conflicting values, the <soap:operation> s style is the one you should pay attention to because the <soap:binding> s style is meaningful only if the <soap:operation> does not have a style attribute The soapAction attribute of <soap:operation> tells you the value of the SOAPAction HTTP header to use when invoking this particular operation Next, the use attribute of <soap:body> is set to literal for both <input> and <output> messages This tells you that the contents of the SOAP <Body> in the request and response messages are fully described using the schema declaration for the elements ExampleDocLit and ExampleDocLitResponse That is, there are no additional rules that you have to be aware of to format the request and response messages, all the information you need is in the schema that s in the <types> section Contrast this to encoded messages which require that you know the rules of encoding used, eg SOAP Section 5 encoding rules The <service> element contains one port which points to the binding I just discussed The <port> also contains a <soap:address> with the location attribute telling you where the service is located, ie where to send your SOAP request message to invoke this service When you use document/literal style all you really need is a schema describing the input and output message content, the value of the SOAPAction and the end point (service) URL Therefore the WSDL for document/literal style is very simple with the <types> section containing most of the information
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