Introduce the difference between XML and HTML

XML is designed to describe data, with the focus being the content of the data.
HTML is designed to display data, with the focus being on the appearance of the data. Basic knowledge you should master:
Before you continue learning, you need to have a basic understanding of the following knowledge: HTML / XHTML JavaScript or VBScript What is XML? XML means extensible Markup Language (EXtensible Markup Language) XML is a markup language, much like HTML. XML is designed to describe data. XML tags are not predefined. You need to define the labels yourself. XML uses Document Type Declaration (DTD) or XML Schema to describe data. XML with a DTD or XML Schema is designed to be self-describing. XML is a W3C standard XML is a W3C standard
Extensible Markup Language was established as a W3C standard on February 10, 1998. The main difference between XML and HTML
XML is designed to carry data.
XML is not used to replace HTML.
XML and HTML are designed for different purposes:
XML is designed to describe data, and its focus is the content of the data.
HTML is designed to display data, with the focus being on the appearance of the data.
HTML is designed to display information, while XML is designed to describe information. XML without any behavior
XML is no behavior.
Maybe this is a little hard to understand, but XML won't do anything. XML is designed to structure, store and transmit information.
The following is a note written by Jani to Tove, stored as XML:
ToveJaniReminder Don't forget me this weekend!
This tag has a title and a message. It also contains information about the sender and receiver. However, this XML document still doesn't do anything. It's just pure information wrapped in XML tags. We need to write software or programs to transmit, receive and display this document. XML is free and extensible.
XML tags are not predefined. You have to "invent" your own labels.
The tags used to mark HTML documents and their structures are predefined. Authors of HTML documents can only use those tags defined in the HTML standard (such as

,

.).
XML allows creators to define their own tags as well as their own document structure.
The tags in the above example have not been defined in any XML standard. These tags were invented by the authors of XML documents. XML is a complement to HTML
XML is not a substitute for HTML.
It is very important that you understand that XML is not a replacement for HTML. In the future of Web development, the most likely scenario is that XML will be used to describe data, and HTML will be used to format and display this data.
Our best description of XML is: XML is a cross-platform, software- and hardware-independent tool for transmitting information. The role of XML in future Web development
XML will be everywhere.
When we see the rapid development progress of the XML standard and the rapid pace at which a large number of software developers adopt this standard, we can't help but sigh. This is really amazing.
We firmly believe that XML will play no less important role in the future of the Web than HTML, which has always been the cornerstone of the Web, and that XML will become the most commonly used tool for all data processing and data transmission.

The above is the detailed content of Introduce the difference between XML and HTML. For more information, please follow other related articles on the PHP Chinese website!