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CHAPTER 3 WEB VOCABULARIES
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Understanding WSDL Document Structure
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WSDL files are stored in locations that are accessible via the web. Anyone consuming the web service accesses these files. For example, you can find the Google web search WSDL at http://api.google.com/GoogleSearch.wsdl. A WSDL document starts with an optional XML declaration and contains the <types>, <message>, <binding>, and <service> elements. The following code block shows the file structure of a WSDL file: < xml version="1.0" encoding="utf-8" > <definitions> <types> <!-- datatype definitions --> </types> <message> <!-- message definitions --> </message> <portType> <operation> <!-- operation definitions --> </operation> </portType> <binding> <!-- binding definitions --> </binding> ..<service> ..</service> </definitions> Table 3-1 explains each of the sections. Table 3-1. The Major Elements Within a WSDL File
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Element
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<definitions> <types> <message> <portType> <operation> <binding> <service>
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Explanation
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Provides the root element for the WSDL document and contains the other elements Defines the data types used by the web service Describes the messages used when the web service is consumed Combines messages to create the library of operations available from the web service Defines the operations that the web service can carry out Lists the communication protocols that a user can use to consume the web service and the implementation of the web service Defines the address for invoking the web service usually a URL to a SOAP service
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CHAPTER 3 WEB VOCABULARIES
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Defining Web Service Data Types
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When someone consumes a web service, the service receives the request, queries an application, and sends an XML document containing the results in response. In order to use the web service, the consumer must know how to phrase the request as well as the format for the returned information. It s crucial to understand the data types used by the web service. The WSDL document defines the data types for both the inputs to and the outputs from the web service. These might equate to the data types listed in the XML schema recommendation, or they could be more complicated, user-defined data types. If you re only using W3C built-in simple data types, the WSDL file doesn t include the <types> element. The XML schema namespace appears in the <definitions> element and references data types in the <message> elements: xmlns:xsd="http://www.w3.org/2001/XMLSchema" Custom data type definitions appear in the <types> element. The WSDL file can use XML schema declarations or any alternative schema system for defining these data types: <types> <schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"> <!-- schema declarations here --> ..</schema> </types>
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Mapping Data Types to Messages
A consumer calls the web service and provides inputs. These inputs map to <message> elements. Each message has <part> elements that refer to each of the inputs received: <message name="mName"> <part name="mInputName" type=" mInputNameType"/> </message> The types referred to in the <message> elements must come from one of the schema namespaces within the document. If the type refers to the simple built-in data types from the XML schema recommendation, the element includes a reference to the XML schema namespace: <message name="mName"> <part name="mNameIO" type="xsd:string"/> </message>
Listing Web Service Operations
The most important element in the WSDL document is the <portType> element. This element defines all of the operations that are available through the web service. The <portType> element is like a library of all of the available operations.
CHAPTER 3 WEB VOCABULARIES
The <portType> element contains <operation> elements that have <input> and <output> elements. Inputs pass to an application for processing. The outputs are the responses received from the application that are passed to the consumer: <portType name="ptName"> <operation name="oName"> <input message="oNameRequest"/> <output message="oNameResponse"/> </operation> </portType> The <message> elements define the inputs and outputs. They are normally prefixed with the current document s namespace. A web service can carry out four types of operations. The most common is the requestresponse type. In this type, the web service receives a request from a consumer and supplies a response. A web service can also carry out a one-way operation, where a message is received but no response is returned. In this case, the operation has an <input> element. The other options are solicit-response, where the web service sends a message and then receives a response. It is the opposite of a one-way operation. The operation has an <output> element followed by an <input> element. You can also specify a <fault> element. The final option is notification, where the service sends a message and only has an <output> element.
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