an introduction to xml and web technologies

What is the difference between HTML and XML?
HTML works with predefined tags like , , , etc. With XML, the author must define both the tags and the document structure. Most XML applications will work as expected even if new data is added (or removed). Imagine an application designed to display the original version of note.xml ( ).
What languages are based on XML?
There are many languages based on XML, including XHTML, MathML, SVG, RSS, and RDF. You can also define your own. The whole structure of XML and XML-based languages is built on tag s. XML - declaration is not a tag. It is used for the transmission of the meta-data of a document. Used version XML in this document. Used encoding in this document.
What is XML & its applications?
Extensible Markup Language (XML) is a meta-language for defining new languages. Its impact on the modern and emerging web technologies has been (and will be) incredible and it has represented the foundation of a multitude of applications. This chapter is devoted to the presentation of XML and its applications.
What is XML (Extensible Markup Language)?
This page was last modified on Jul 10, 2023 by MDN contributors. XML (Extensible Markup Language) is a markup language similar to HTML, but without predefined tags to use. Instead, you define your own tags designed specifically for your needs. This is a powerful way to store data in a format that can be stored, searched, and shared.

Overview

XML (Extensible Markup Language) is a markup language similar to HTML, but without predefined tags to use. Instead, you define your own tags designed specifically for your needs. This is a powerful way to store data in a format that can be stored, searched, and shared. Most importantly, since the fundamental format of XML is standardized, if you share or transmit XML across systems or platforms, either locally or over the internet, the recipient can still parse the data due to the standardized XML syntax. There are many languages based on XML, including XHTML, MathML, SVG, RSS, and RDF. You can also define your own. developer.mozilla.org

Structure of an XML document

XML declaration XML - declaration is not a tag. It is used for the transmission of the meta-data of a document. developer.mozilla.org

"Correct" XML (valid and well-formed)

Correct design rules For an XML document to be correct, the following conditions must be fulfilled: •Document must be well-formed. •Document must conform to all XML syntax rules. •Document must conform to semantic rules, which are usually set in an XML schema or a DTD (Document Type Definition). Example Now let's look at a corrected version of that same document: A document that contains an undefined tag is invalid. For example, if we never defined the tag, the document above wouldn't be valid. Most browsers offer a debugger that can identify poorly-formed XML documents. developer.mozilla.org

Entities

Like HTML, XML offers methods (called entities) for referring to some special reserved characters (such as a greater than sign which is used for tags). There are five of these characters that you should know: Even though there are only 5 declared entities, more can be added using the document's Document Type Definition. For example, to create a new &warning; entity, you can do this: developer.mozilla.org

Displaying XML

XML is usually used for descriptive purposes, but there are ways to display XML data. If you don't define a specific way for the XML to be rendered, the raw XML is displayed in the browser. One way to style XML output is to specify CSS to apply to the document using the xml-stylesheet processing instruction. developer.mozilla.org

Recommendations

This article is obviously only a very brief introduction to what XML is, with a few small examples and references to get you started. For more details about XML, you should look around on the Web for more in-depth articles. Learning the HyperText Markup Language (HTML) will help you better understand XML. developer.mozilla.org