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Messaging: This group defines how to format the XML messages that Web services exchange It includes the SOAP specification for encoding messages, and the XML and XSD specifications for the message vocabulary The specifications are independent of a particular transport protocol The Messaging group also includes the WS-Addressing specification, which decouples destination information for the request from the underlying transport protocol WS-Addressing can, for example, be used to define multiple destinations for an XML message Description: This group defines specifications that allow a Web service to describe itself The core specifications are WSDL (for the service contract) and XSD (for defining data type schemas) It also includes the WS-Policy specification, which describes the policy that a Web service enforces when it communicates with a client For example, a Web service may have specific requirements for how its interface operations are called.

Lastly, Table 4-13 lists the methods of the Sys.Component class. Table 4-13. Methods of the Sys.Component Class Method Name

The WS-Policy specification allows the Web service to tell prospective clients what rules to follow in order to execute a successful service request Finally, this group includes the UDDI specification for discovering and describing Web services Service Assurances: Web services cannot simply exchange XML messages They must also provide the client with some assurance that the messages will be transmitted in a secure way, and that the client can expect some kind of response, even if something goes wrong at some point in the workflow This group of specifications includes WS-Security (which provides authentication mechanisms), WS-Reliable Messaging (to ensure the delivery of messages over unreliable networks), and several transaction-related specifications Service Composition: The wide array of specifications in the WS-I Basic Profile cannot all be implemented in every Web service Developers must pick and choose which specifications are important for a particular Web service.

[System.Xml.Serialization.XmlTypeAttribute( Namespace="http://www.bluestonepartners.com/schemas/StockTrader/")] public class Quote { string Symbol; // Additional type definitions go here (not shown) } This class was entirely autogenerated by the wsdl.exe utility. The only modification we made was to change the autogenerated name of the proxy class from StockTraderService to our preferred name of StockTraderProxy. Figure 3-7 shows the Visual Studio 2005 Solution Explorer as it appears when you add a consumer project to the same solution file as the StockTrader Web service. Note that this is done for convenience to make debugging the projects simpler. In reality, the Web service and the consumer projects would be located on separate servers, and likely in different domains.

A boolean value called by the create method to indicate that the process of setting properties of a component instance has begun Creates and initializes a component Removes the component from the application Called by the create method to indicate that the process of setting properties of a component instance has finished Initializes the component Raises the propertyChanged event of the current Component object for a specified property Called by the endUpdate method of the current Component object

To enable this, Web services support service composition, which allows developers to selectively pick specifications and to aggregate them and record them in the WSDL document..

I introduce you to the WS-Specifications again in 5, and then cover them in detail in the remaining chapters of the book. Briefly, here is a summary of the most important WS-Specifications and their purpose:

The Sys.UI namespace provides much of the needed infrastructure for developing client visual controls. This includes numerous properties, events, and classes that can be extended. Sys.UI inherits some of its functionality from the Sys.Component namespace. Some of the members of this namespace are critical for anyone implementing custom client controls (Sys.UI.Control) or behaviors (Sys.UI.Behavior) but used less often for everyday AJAX development. Lastly, there are also classes for better control over DOM elements and events in the browser. Table 4-14 lists the classes of the Sys.UI namespace.

Note This chapter does not provide specific instructions for how to create the consumer project, so

1

Base class for all ASP .NET AJAX client behaviors Object containing a number of properties for a specific position such as position, width, and height Base class for all ASP .NET AJAX client controls Main class for handling client-side controls in the browser DOM Main class for handling client-side events in the browser, which includes the ability to dynamically attach and detach events from corresponding event handlers Object containing integer coordinates of a position

Figure 3-7. The Visual Studio 2005 Solution Explorer shows the StockTrader Web service and the Web service consumer project.

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