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In order for a service consumer (application) to use the service provided by a service provider application, a formal description of the service is required that contains the description of the interface exposed by the service and information on where that service can be found on the network. Such a formal specification is provided by the Web Services Description Language (WSDL). A WSDL document is an XML-based document that describes a formal contract between the service provider and the service consumer. Detailed information on the WSDL 1.1 standard can be found at http://www.w3.org/TR/wsdl. A WSDL document is an XML instance. The schema from which such a document instance is derived is located in the target namespace http://schemas.xmlsoap.org/wsdl/. In addition to the WSDL specification, WS-I Basic Profile provides guidance on how to write the WSDL documents so that service interoperability across different platforms can be made more certain. In general, WS-I Basic Profile puts further restrictions on the WSDL standard. A WSDL document describes two aspects of a service: the abstract interface exposed by the service and the description of the concrete implementation. The abstract interface describes the general interface structure, which includes the operations (that is, methods) in the service, the operation parameters, and abstract data types. This description of the interface does not depend in any way on the concrete implementation, such as the concrete network address, the concrete data structures, and the communication protocol. An abstract interface can have many corresponding implementations, giving the service consumer a choice of implementation and allowing it to pick the implementation that best suits its technical capabilities. The concrete implementation description binds the abstract interface description to a concrete network address, communication protocol, and concrete data structures. The concrete implementation description is used to bind to the service and invoke its various operations (methods).
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In the next section, we start first with an overview of a WSDL document using an example of a weather service. For simplicity, we assume that this service has only one operation: getWeather. This operation takes information needed to identify the city of the world and return weather information for the current day. Next, we describe the general structure of a WSDL document. Following this we discuss in detail the abstract interface part of a WSDL document as well as the implementation part of the WSDL document. We then discuss the logical relationship between the different elements of a WSDL document as well as describe the SOAP extensibility elements related to SOAP binding. Overview In this section, we provide an overview of WSDL by considering a simple example of a weather service. The service has only one operation: getWeather. This operation takes input information related to identifying a city in the world and returns the weather of that city for the current day. The information required for city identification includes the city name, the state/province, and the country. The returned weather information includes temperature, weather conditions (sunny, cloudy, and so on), wind direction, and wind speed. We start the discussion by first focusing on the interface description in the WSDL document. The part of the WSDL document that describes the interface portion for the weather service is shown in Listing 13-1.
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Listing 13.1: Example of interface description 1 <definitions name="globalWeatherService" 2 targetNamespace=http://globService.com/ns/globalWeather/wsdl 3 xmlns:tns=http://globalService.com/globalWeather/wsdl 4 xmlns:SOAP-EXT=http://schemas.xmlsoap.org/wsdl/soap/ 5 xmlns=http://schemas.xmlsoap.org/wsdl/> 6 <types> 7 <schema 8 targetNamespace=http://globalService.com/ns/globalWeather/wsdl 9 xmlns=http://www.w3.org/2001/XMLSchema> 10 <complexType name="inputType"> 11 <sequence> 12 <element name="City" type="xsd:string"/> 13 <element name="State" type="xsd:string"/> 14 <element name="Country" type="xsd:string"/> 15 </sequence> 16 </complexType> 17 <complexType name="outputType"> 18 <sequence> 19 <element name="temperature" type="xsd:int">
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<element name="condition" type="xsd:string"> <element name="windSpeed" type="xsd:decimal"> <element name="windDirection" type="xsd:string"> </sequence> </complexType> </schema> </types> <message name="inputParameters"> <part name ="input" type="inputType"/> </message> <message name="outputParameters"> <part name="output" type="outputType"/> </message> <portType name="weatherServicePortType"> <operation name="getWeather"> <input message="tns:inputParameters"/> <output message="tns:outputParameters"/> </operation> </portType>
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The main element of this interface is the portType (lines 33 35). This element contains all the operations a service of this kind will support. In this example, the port is named weatherServicePortType, and it supports only one operation: getWeather. As shown in the listing, the operations themselves are represented as XML elements. In our example, this operation is a request/response operation because it contains an input message and an output message. In general, you can have several types of operations, including a one-way operation. An operation contains all the messages exchanged between the service provider and service consumer. In addition, you can define additional fault elements that can appear as direct child elements of the element operation. We have defined two messages (lines 27 29 and lines 30 32). The message inputParameters defined in lines 27 29 is linked by name to the input element of the operation getWeather. Hence, this message represents the data that is sent from the service consumer to the service provider when the operation getWeather is invoked. Similarly, the message outputParameters defined in lines 30 32 represents the data that is sent from the service provider to the service consumer as a response message. In our example, each of the two messages consists of one part. However, in general, a message can have multiple parts, thus giving a structure to the message. A part is linked to types. For example, in Listing 13-1, the message inputParameters consists of only one part that refers to one complex type named inputType. This complex type has three elements: City, State and Country. Each of these child elements are of the string type.
Thirteen Summary of Abstract Interface De nition Elements Short Description A container of all abstract data types de nitions. WSDL 1.1 prefers the use of XML schema types de nitions. Each part is associated with a data type. A message represents a logical unit of data that consists of one or more part elements. An operation abstractly de nes a service method. It may consist of an input message, an output message, and, optionally, several fault messages. A collection of operations is called a portType and must be named.
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