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This article shares with you the content of the sample analysis generated by XML. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The background of XML

XML, like HTML, comes from Standard Generalized Markup Language, the Standard Universal markup language, or SGML for short. SGML existed long before Web was invented. As its name suggests, SGML is a universal language that uses tags to describe documents. It contains a series of document type definitions (DTD for short). The meaning of tags is defined in DTD, so the syntax of SGML can be extended. SGML is very large, neither easy to learn nor easy to use, and it is also very difficult to implement on computer. In view of these factors, researchers at CERN, the inventor of Web, proposed the HTML language based on the capabilities of computer technology at that time (1989).

HTML uses only a small number of tags in SGML, such as HTML 3.2, which defines 70 tags. In order to facilitate implementation on the computer, the tag specified by HTML is fixed, that is, the HTML syntax is not extensible, and it does not need to include DTD. The fixed syntax of HTML makes it easy to learn and use, and it is also very easy to develop HTML browsers on computers. It is precisely because of the simplicity of HTML that Web technology has moved from the computer industry to the whole society and to thousands of households, and the development of Web is in full swing.

In recent years, with the more and more extensive and in-depth application of Web, people gradually feel that HTML is not enough, and the simple syntax of HTML seriously hinders the use of HTML to express complex forms. Although HTML has launched one new version after another, with expression functions such as scripts, tables, frames, and so on, it has not been able to meet the growing demand. On the other hand, computer technology has developed rapidly in recent years, and it has been possible to implement Web browsers that are much more complex than when HTML was invented, so it is necessary and possible to develop a new Web page language.

It has been suggested that SGML be directly used as the Web language, which can certainly solve the difficulties encountered by HTML. However, SGML is so large that it is not easy for users to learn and use SGML. it is very difficult to fully implement SGML browsers, so it is natural to think of using only a subset of SGML, which makes the new language easy to use and easy to implement. It is in this situation that the Web standardization organization W3C recommends the use of a streamlined version of SGML-XML came into being.

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