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To get a better feel for WSDL, let's look at one sample service the price-quoting service we hinted at earlier Suppose that this service consists of a single operation that computes price quotes for a given product Specifically, given a string that indicates the name of the product, this operation will return a floating-point value that indicates the product's price
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Given this service specification, we'll see how to encode the corresponding service description using WSDL Messages and Types First things first We need to think about the types and messages being communicated In terms of types, we know that the client/service interaction will involve the client sending a product name (a string) and receiving a price (a floating point) Thus, we can define two logical types that map to physical types In particular, let's name the request message ProductPriceRequest (a string) and the response message ProductPriceResponse (a floating point) Correspondingly, part of our WSDL document will contain information about the types
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<types> <schema targetNamespace="http://wwwexamplecom/pricequotexsd" xmlns="http://wwww3org/2000/10/XMLSchema"> <element name="ProductPriceRequest"> <complexType> <all> <element name="productName" type="string"/> </all> </complexType> </element> <element name="ProductPriceResponse"> <complexType> <all> <element name="price" type="float"/> </all> </complexType> </element> </schema> <types>
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Next, it's a simple matter to associate these types with the logical messages our service operation will send and receive:
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<message name="PriceQuoteInput"> <part name="body" element="xsd1:ProductPriceRequest"/> </message> <message name="PriceQuoteOutput"> <part name="body" element="xsd1:ProductPriceResponse"/> </message>
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Port Types and Bindings With types and messages defined, we can move on to describing the operations of our service To keep things simple, we'll worry about only one logical operation the ability to get a price quote which we'll name GetPriceQuote
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First, we need to define a logical port a port type that receives one message as input and one as output
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<portType name="PriceQuotePortType"> <operation name="GetPriceQuote"> <input message="tns:PriceQuoteInput"/> <output message="tns:PriceQuoteOutput"/> </operation> </portType>
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Next, we want to define at least one physical binding to that logical port an actual mechanism for accomplishing the abstract operation defined by it The following definition demonstrates how to create a SOAP binding (more about SOAP shortly) for our service that maps to the GetPriceQuote operation we previously defined
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<binding name="PriceQuoteSoapBinding" type="tns:PriceQuotePortType"> <soap:binding style="document" transport="http://schemasxmlsoaporg/soap/http"/> <operation name="GetPriceQuote"> <soap:operation soapAction="http://wwwexamplecom/GetPriceQuote"/> <input> <soap:body use="literal"/> </input> <output> <soap:body use="literal"/> </output> </operation> </binding>
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Ports and Services Finally, it's time to define and name the service itself As part of that definition, we want to create a series of physical ports that correspond to service functionality Defining each physical port requires that we associate it with a physical binding:
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<service name="PriceQuoteService"> <documentation>The Price Quote Service</documentation> <port name="PriceQuotePort" binding="tns:PriceQuoteBinding"> <soap:address location="http://wwwexamplecom/pricequote"/> </port> </service>
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At this point, we have a rough idea of what the language for communicating with a Web service will be like A service is associated with a binding, and clients who use the binding communicate with the service by sending named, text-based messages The service parses these messages as requests and returns replies, also in named, text-based messages Now it's time to find out more
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about one particularly important binding SOAP and understand some of the details involved in using it You can think of SOAP simply as the distributed object communication protocol for the Internet The general idea is to allow programmatic access to remote, Internet-based functionality via HTTP Although our discussion will focus on SOAP as it's deployed over HTTP, SOAP is indeed a higher-application-level protocol and makes sense as deployed over other communication substrates, such as RPC The W3C acknowledgment of SOAP (http://wwww3org/TR/soap) breaks the protocol into three basic parts:
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The SOAP envelope, which defines an overall framework for expressing what's in a message, who should deal with it, and whether it's optional or mandatory The SOAP encoding rules, which define a serialization mechanism that can be used to exchange instances of application-defined data types The SOAP RPC representation, which defines a convention that can be used to represent remote procedure calls and responses
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