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Microsoft suggests two rules of thumb for deciding whether to use web services. If you need to cross platform boundaries (for example, communicate between a .NET and a Java application) or trust boundaries (for example, communicate between two companies), web services make great sense. Web services are also a good choice if you want to use built-in ASP.NET features such as caching or IIS features such as SSL security or Windows authentication. They also make sense if you want to leave yourself open to third-party integration in the future. However, if you simply want to share functionality between two .NET applications, web services can be overkill and they may introduce unnecessary overhead. For example, if you simply want web applications to have access to specific business logic, a much better approach is to create a class library assembly (which is compiled to a DLL) and use it in both applications. This avoids the overhead of out-of-process or network communication, which can be significant. Finally, if you want to distribute functionality so it can be accessed remotely, but both the client and server are built using the .NET Framework, you might want to consider using .NET remoting instead. Remoting doesn t provide the same level of support for open standards such as SOAP, but it does give you the freedom to use different types of communication, proprietary .NET data types, stateful objects, and faster TCP/IP communication. In short, remoting offers more features and the possibility to enhance performance for .NET-only solutions.

A new technology is doomed if it does not give new opportunities for the people concerned with making money. From a businessperson s perspective, web services open new possibilities for the following reasons: New payment structures: The user of a web service can pay a subscription fee for using the service. One example may be the news feed from Associated Press. Another possibility is a payper-view, or micro payment, model. A provider of a credit verification service, for instance, may charge per request. Real-time interaction and collaboration: Today, data is typically replicated and used locally. Web services enable real-time queries to remote data. An example is an e-commerce site selling computer games. The e-commerce site may hook up to a warehouse to get the number of items in stock in real time. This enables the e-commerce site to provide a better service. Nothing is more frustrating than buying something over the Internet just to learn the next day that the product you wanted is out of stock. Aggregated services: A web service may aggregate other web services, screen-scraped websites, legacy components exposed using proprietary protocols, and so on. A typical example of an aggregated service is a comparative service giving you the best deal on products. Another type of service is one that groups related services. For example, imagine you re moving to a new home. Someone could provide you with a service that can update your address at the post office, find the transportation company to move all your possessions, and so on. Web services are by no means the only technology that can provide these solutions. Many similar solutions are available today using existing technology. However web services have the momentum and standards to make these kinds of services generally available.

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The key to the success of web services is that they are based on open standards and that major vendors such as Microsoft, IBM, and Sun are behind these standards. Still, open standards do not automatically lead to interoperability. First, the vendors must implement all the standards. Furthermore, they must implement the standards in a compatible way. Several specifications are used when building web services. Figure 32-1 shows the web service stack as it exists today.

Arbitrary positional and keyword arguments may be used with other standard argument declarations. Mixing them requires some care, as their order is important to Python. Arguments can be classified into four categories, and while not all categories are required, they must be defined in the following order, skipping any that are unused.

You ll learn much more about the SOAP, WSDL, and UDDI protocols that support web services in the next chapter. However, before you get started creating and using web services, it s important to get a basic understanding of the role these standards play. Table 32-2 summarizes these standards, and the next few sections fill in some of the details. You ll get into much more detail in the next chapter. Table 32-2. Web Service Standards

Used to create an interface definition for a web service. The WSDL document tells a client what methods are present in a web service, what parameters and return values each method uses, and how to communicate with them. The message format used to encode information (such as data values) before sending it to a web service. The protocol over which all web service communication takes place. For example, SOAP messages are sent over HTTP channels. Used to create discovery documents that provide links to multiple web service endpoints. This standard is Microsoft-specific and will eventually be replaced by a similar standard named WS-Inspection. A standard for creating business registries that catalog companies, the web services they provide, and the corresponding URLs for their WSDL contracts.

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