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In this chapter, you studied the structure of a WSDL document and found that it contains seven XML elements in addition to a root element called <definitions>. The seven additional elements are divided into two groups: one set provides an abstract description of the Web service, while the other set provides concrete implementation details that associate the abstract descriptions with the physical Web service. The XML elements for abstract description are <types>: This element lists all of the data types that are exchanged by the XML messages as input parameters or return types. <message>: This element describes a SOAP message, which may be an input, output, or fault message for a Web service operation. <operation>: This element is analogous to a method definition; however, it only allows you to define input, output, and fault messages that are associated with the operation. <portType>: This element lists all of the operations that a Web service supports. The XML elements for concrete implementation are <binding>: This element links the abstract and concrete elements together within a WSDL document. <port>: This element defines the URL where the Web service is located, and it also implements a <binding> element. <service>: This element encloses one or more <port> elements. The chapter concluded with a brief look at how to generate and work with WSDL documents. In the following two chapters, I will give you a detailed look at how to build message-oriented Web services and how to work with WSDL documents and XSD schema definition files.

A better Oven implementation would be as follows: class Oven { private int _temperature; public void SetTemperature( int temperature) { _temperature = temperature; } public bool IsPreHeated() { return false; } }.

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All right, we ll give you one more illustration of E4X (we ve saved the best for last). The flashBooks.xml file included with this chapter s Exercise folder files has slightly different pageCount attributes from those shown earlier in the chapter. Instead of a whole phrase, such as 500 pages, these attributes show only numbers. Why It s because E4X allows you to evaluate comparisons so you can filter content based on specific criteria. Let s say you want to know which books have a page count longer than 550 pages. Return again to our humble trace() function, and update its parameter to the following: trace(xmlDoc.book.(@pageCount > 550)); The result is a list of the <book> elements whose pageCount attribute is greater than 550, along with all their children (see Figure 12-6).

Figure 12-6. E4X allows filtering by way of comparison operators. The parentheses tell Flash that you re intending to filter the returned XMLList instance. Inside the parentheses, the expression is a simple comparison, @pageCount> 550, which in plain English would be, Yo, dude, which <book> elements pageCount attributes match this criterion Flash searches every <book> element in the bunch because nothing appears between the word book and the dot that begins the next expression. What if you want only the title of these books Try this: trace(xmlDoc.book.(@pageCount > 550).@title.toXMLString()); The trick to understanding this expression, as always, is to break it into its parts. On its own, each concept is usually easy enough to understand. These concepts these subexpressions are separated by dots. A blow-by-blow account of the preceding trace() goes like this:

IN A SERVICE-ORIENTED ARCHITECTURE (SOA), the purpose of Web services is to exchange and process XML messages, not simply to act as hosts for Remote Procedure Call (RPC) style methods. The difference is that messages are bound to rich and complex operations, whereas RPC-style methods simply return a discrete result that is directly correlated to a specific set of input parameters. For example, a message-oriented Web method will accept a stock ticker symbol and will return a detailed stock quote in response. In contrast, an RPC-style Web method will return a simple output value. Unfortunately, development tools such as Visual Studio .NET place a methodcentric focus on Web services that causes you to lose sight of the bigger design picture and to take the underlying infrastructure for granted. It is very easy to build a Web service by creating an .asmx file and then throwing together several loosely related RPC-style Web method implementations. However, this is the wrong design approach because such a Web service fails to provide an integrated set of message endpoints. In simpler terms, the Web service fails to provide a service. The right design approach is always to think in terms of operations and XML messages, and to consider how the Web service methods work together to provide a service. This chapter begins with a challenge for you to set aside what you have learned about Web services development until now, and to open your mind to a different design approach one that is based on integrated XML messages, not on RPC-style methods.

XML (DYNAMIC DATA)

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