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This article will explain in detail why XML is very important to Web services. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Web services are often described from the perspective of its component technology. SOAP, UDDI, WSDL, xml and HTTP constitute a part of the Web service system, and they all play an important role. Let's take a look at the contribution of XML technology to the Web services platform.

Standardization

Compared with other Web service technologies, standardization is one of the features of XML. XML provides a standard format for transferring data between Web service applications. The World wide Web Consortium (W3C) manages XML standards and publishes them to XML technology providers around the world, which ensures the compatibility of XML products.

In addition to the XML engine and products, there are XML grammars (grammar). Each XML syntax is a standard way to format data in a particular problem domain. By following and adopting the XML grammar, you can standardize the data format for communication between two applications.

Interface protocol

Programmers often call an interface a protocol when programming it. From a programming perspective, the interface provides a programming structure without exposing the implementation. If you use DTD (file type definition) and outline (schema), then XML has similar features. Both DTD and outline are used to describe the structure of XML documents and the rules for creating XML documents. Such a set of rules can be organized with one (or more) related DTD (or outline), which we call XML grammars.

XML grammar can not only be used to standardize communication between applications, but also provide an interface protocol for developers. In other words, when a developer creates an application that needs to use an XML document structure, he doesn't need to know how the document is implemented (that is, the actual XML document). The DTD and outline describe the structure of the document, which can be used as an interface protocol for development. Any changes to DTD also change the agreement.

Simplify

Another important aspect of XML documentation is its simplification. I'm not implying that the implementation of XML is simple, but that the concept and general approach of XML are simple. For example, XML is based on text documents, which simplifies the process of opening an XML document and viewing its contents.

It is also important to simplify the Web service model with XML. Web services are inherently more complex than individual XML. Assuming that XML and CORBA are equally complex, and other Web services technologies have the same complexity, then Web services technologies will become very cumbersome. But by using simple building blocks, such as XML, SOAP, and so on, we can control the complexity of Web services within a tolerable range so that the applications created with it are not difficult to control.

Encapsulation

Encapsulation is one of my favorite XML features, especially when developing Web services. In essence, encapsulation refers to the concept of taking one or more data blocks (chunks of data) and aggregating them into a simple object (rather than several separate objects). Encapsulation is similar to aggregation, but there is an important difference between them, that is, encapsulation generally means that it has no external dependency.

You can create XML documents with external dependencies; however, in the transactional Web service model (transactional Web services model), it is wiser to use encapsulation. By designing XML solutions that package dependencies, you can generally eliminate problems in the transaction process (transactions). Forcing external data to be located and consistent with XML data in a transaction is harmful, especially when external data often changes. If the data is encapsulated in a XML grammar, the transaction will get the correct data.

This is the end of the article on "Why XML is important to Web Services". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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