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OPTIONS Supported Header Fields Used with Response 407 Sending to UA M M M M M Receiving from UA I I M I I

Listing 7.2: An example of SOAP message <soap:envelope xmlns:soap="http://schemas.xmlsoap.org/soap/ envelope/" soap:encodingStyle="http:/schemas.xmlsoap.org/soap/encoding/"/> <soap:header> </soap:header> <soap:body> <m:GetLastTradePrice xmlns:m="http://example.org/ Tradeprice" > <tickerSymbol> IBM </tickerSymbol> </m:GetLastTradePrice> </soap:body> </soap:envelope>

OPTIONS Supported Header Fields Used with Response 415 Sending to UA M M M M M M Receiving from UA I I I I I I

Builds credibility A newsletter lets people know you re on the ball and actively managing your business. Reminds them about you Web shoppers are fickle and will go anywhere they can find the best price unless you develop a sense of loyalty.

WSDL Web Services Description Language (WSDL) is an XML-based language for describing the interface and other characteristics of a Web Service. This is the second application of XML to solve the heterogeneity problems mentioned earlier in this chapter. WSDL offers the following advantages in the description of the services as compared to previously described approaches:

OPTIONS Supported Header Fields Used with Response 420 Sending to UA M M M M Receiving from UA I I I M

Unlike CORBA s IDL and RPC s speci cation les, WSDL is more completely agnostic toward programming languages and middleware technologies. This feature of WSDL is the direct result of it being based on XML, thus making WSDL suitable to describe almost any type of service. WSDL provides a method of specifying a communication protocol for invoking a service. Therefore, a service is free to choose any protocol it can conveniently implement. WSDL also provides a way to specify a message format for communicating with a given service. Therefore, a service is free to choose any convenient message format. An example of a message format is SOAP.

Gives them new reasons to visit your site Your newsletter can include descriptions of products your customers didn t buy and didn t know about originally. You introduce them to your entire product line; since they already know and trust you, they re more likely to purchase one of those new items than someone who s visiting you for the first time.

OPTIONS Supported Header Fields Used with Response 421 or 494 Sending to UA O O M M Receiving from UA M O N/A M Security mechanism Use

WSDL also provides wide latitude for the service provider to specify the type of service operations they offer. In general, four different types of service operations can be speci ed, including synchronous operations and asynchronous operations. Finally, WSDL has a method for specifying a service end point. A service end point is the network address at which the service is available for invocation.

OPTIONS Supported Header Fields Used with All Other Responses Sending to UA M M M M M M M M M M M M X M M M X M M M M M M M M Receiving from UA M M I I I M I M M M I M M M M M M M M I I M I M I Access network identifier Asserted identity Charging function addresses Charging vector identifier Preferred identity Privacy mechanism Required methods Insertion of date in requests and responses Use

It is instructive to look at an example of a WSDL document. A sample WSDL document is shown in Listing 7-3 that declares a service for getting weather information.

A newsletter like Creative Paper s requires a commitment on your part. You or one of your employees (or a freelance writer like me) will have to be assigned to provide copy for it. Like many other parts of your business, a newsletter requires work up front but brings benefits in the long run. But then, a newsletter is a twentieth-century communications tool. If you want to really be on the cutting edge, you can create a blog for your area of business. A blog is an online diary that you or staff need to update on a regular basis. The eBay business profiled later in this chapter, Dallas Golf, operates such a blog through the blog hosting service TypePad (see Figure 10-4).

Content-Disposition Content-Encoding Content-Language Content-Length Content-Type Cseq Date From MIME-Version Organization P-Access-Network-Info P-Asserted-Identity P-Charging-Function-Addresses P-Charging-Vector P-Preferred-Identity Privacy Require Server Timestamp To User-Agent Via Warning

Listing 7-3