html xml difference

HTML and XML are both markup languages ​​used to describe the structure of documents, but there are obvious differences between them. This article will explain the differences between HTML and XML from many aspects such as syntax and application scope.

1. Syntax differences
HTML is a tag-based language, which provides many predefined tags, such as

, , , etc. These tags Used to describe the structure and style of web content. XML does not have predefined tags. Developers need to define their own tags to describe the structure and hierarchy of the document. This means that XML is more flexible and can adapt to a wider range of applications.

2. Different application scenarios
The main function of HTML is to display content on the Web. It is widely used in Web development and can be used to create web pages and web applications. XML has a wider range of applications and can be used for data storage and transmission. It can be used to describe documents or define custom data formats.

3. Different standard-setting organizations
The HTML-formulating organization is W3C (World Wide Web Consortium), which is an organization composed of Web industry authorities and is committed to formulating Web standards. The XML 1.0 standard was jointly created by the W3C and other organizations. The basis of XML 1.0 is SGML, which is a globally accepted standard universal markup language.

4. Different levels of syntax strictness
HTML has a looser syntax than XML. Even if there are errors, they can be automatically corrected by the browser's parser. XML requires strict format, and any document that does not meet the format requirements cannot be parsed. Therefore, XML not only requires well-written text, but also requires a standardized definition.

5. Different element types and markup syntax
Most HTML elements have been predefined and wrapped with angle brackets <>----

element,

6. Different data definition methods
In HTML, after the element is defined, the data type of the tag element will change accordingly. In HTML, data definition is mainly done through element tags. In XML, data is mainly defined through DTD (Document Type Definition) or Schema.

To sum up, HTML and XML are both very important markup languages. Although they are both used to describe the document structure, there are still many differences between them. These differences are reflected in the syntax. , application scenarios, standard setting organizations, strictness, element types and markup syntax, data definition methods and many other aspects. Correctly understanding and using these two languages ​​can help web developers build web applications better and more efficiently.

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