What is XML? What is the difference between XML and HTML?

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Release： 2017-03-19 15:06:07

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[Introduction] XML is designed to describe data, and its focus is the content of the data. HTML was 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 XHTMLjavaScript or VBScriptWhat is

xml is designed to describe data, and its focus is the content of the data.

HTML was 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 refers to Extensible Markup Language (EXtensible Markup Language)
XML is a markup language, very similar to HTML
XML is designed to describe data
XML tags are not preset definition. You need to define the labels yourself.
XML uses Document Type Declaration (DTD) or XML Schema to describe data.
XML with DTD or XML Schema is designed to be self-descriptive.
XML is a W3C standard
XML is a W3C standard
Extensible Markup Language was established as a W3C standard on February 10, 1998. www.

Main differences between XML and HTML
XML is designed to carry data.

XML is not intended to replace HTML.

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XML and HTML are designed for different purposes:

XML is designed to describe data, and its focus is the content of the data.

HTML was 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:

<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don&#39;t forget me this weekend!</body>
</note>

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This tag has a title and 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 structure are predefined. Authors of HTML documents can only use those tags defined in the HTML standard (such as