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Xml programming bible phần 8

Trong chương này, chúng tôi đã chia cắt một tập tin WSDL. Chúng ta đã thấy tập tin có cấu trúc như thế nào và những thông tin được bao gồm trong đó. Chúng tôi phát hiện ra những gì các yếu tố của WSDL có ý nghĩa và cách thức chúng được sử dụng bởi các ứng dụng gọi điện thoại để xác định hành vi và đặc điểm của một dịch vụ Web. | Chapter 25 WSDL 653 Figure 25-2 An example of a WSDL editor Because WSDL is good old XML can old be associated with XML yet you can also create your own WSDL editor. It could be fun. Summary In this chapter we have dissected a WSDL file. We saw how the file is structured and what information is included therein. We discovered what the elements of WSDL mean and how they are used by the calling application to determine a Web service s behaviors and characteristics. WSDL is arguably the de facto standard on the Internet for making known to consuming client applications what a Web service does. We also learned about how to dynamically create a Web service proxy class at runtime based on WSDL that is not known at design time. Finally we learned that there are some WSDL editors out there and that one can be created from scratch if desired. UDDI Web services can be used for interaction between remote systems within a single organization. However one of the most promising aspects of Web services is that they can be used business-to-business integration. For example one company might expose an invoicing Web service that the company s suppliers use to send their own internal invoices. Similarly a company might expose a Web service for placing orders electronically using special schemas that the customers can use internally for their own purchasing process. Now if one company wanted to purchase goods from a vendor using a service of this kind how would it find it Let s say the company wants to begin ordering office supplies from a John s International Office Supplies an idea waiting to happen it would need to search for all vendors who sell office supplies over the Internet and then find ones that sell goods using a Web service. To do this the customer needs a directory a sort of yellow pages-type directory of all businesses that expose Web services. This directory is called Universal Description Discovery and Integration or UDDI. UDDI is an industry effort started in .