XMLSGML is a streamlined SGML that combines the rich functions of SGML with the ease of use of HTML in Web applications.XMLThe extensibility of SGML is retained, which enablesXMLIt’s fundamentally different from HTML.XMLMuch more powerful than HTML, it is no longer a fixed tag, but allows an unlimited number of tags to be defined to describe the information in the document, allowing nested information structures. HTML is just a general way of displaying data on the Web, andXMLThis paper provides a general method to process Web data directly. HTML focuses on the presentation format of Web pages, while HTML focuses on the presentation format of Web pages.XMLIt focuses on the content of Web pages.
XMLIt includes XSL (Extensible Style Language) and XLL (Extensible Linking Language).
XSL is used toXMLData is translated into HTML or other languages. XSL provides a functionality of overlapping page CSS that enables developers to construct Web pages with an expression layer structure to distinguish them from others.XMLData structure. XSL can also construct overlapping pages with HTML. XSL can explain an unlimited number of tags, which make the Web more colorful, such as dynamic text, horse-running text. In addition, XSL also handles multinational characters, double-byte display of Chinese characters, various processing of grids, etc.
XLL isXMLLink language, which is similar to HTML links, but more powerful. XLL supports extensible links and multidirectional links. It breaks the simplest link restriction of HTML which only supports hypertext concept, and supports address-independent domain names, bidirectional links, loops, multiple source set links, etc. XLL links can be designated and managed according to user’s requirements without document restriction.
In order to makeXMLEasy to learn and easy to use.XMLStreamlined a large piece of SGML’s rare once-in-a-lifetime functionality. Just as 800 Chinese characters are commonly used in hundreds of thousands of Chinese characters, only 20% of SGML is commonly used.XMLThrow out the unused parts of SGML and make it 80% simpler in one go. Thus,XMLThere are only 30 pages of grammar instructions in SGML, but 500 pages in SGML.
XMLThe design also considers its ease of use, which comes from two aspects: on the one hand, users can write Web pages conveniently, on the other hand, designers can implement it.XMLBrowsers are not too difficult.
In short,XMLThe use of a simple and flexible standard format provides an effective means for Web-based applications to describe and exchange data. HTML describes a common way of displaying global data, whereasXMLIt provides a general method to process global data directly.
Understanding the Definition of Web Page Tool Language XML (2)