What is XML?

Extensible Markup Language, or XML, is a markup language that establishes a set of guidelines for encoding texts in a way that is legible by both computers and humans. XML is a data transit and storing standard that offers a hierarchical and self-descriptive information structure. These are some of the main characteristics of XML:

Markup Language:

XML is a markup language, similar to HTML. However, while HTML is designed for displaying data in a browser, XML is designed for carrying and storing data.

Hierarchical Structure:

XML documents have a hierarchical structure, represented by nested elements. Each element can contain text, attributes, and other elements, creating a tree-like structure.

Tags and Elements:

XML documents consist of tags, which are used to define elements. Elements can contain data or other elements. Tags come in pairs: an opening tag () and a closing tag ().

Attributes:

Elements can have attributes, which provide additional information about the element. Attributes are specified within the opening tag and are used to add metadata to elements.

Self-Descriptive:

One of the key features of XML is its self-descriptive nature. The structure and meaning of the data are defined within the document itself, making it easier for both humans and machines to understand the content.

Platform-Independent:

XML is platform-independent and language-neutral. This means that XML documents can be created and processed on any platform and by applications written in different programming languages.

Use Cases:

XML is widely used for data interchange between different systems and platforms. It is commonly employed in web services, configuration files, data storage, and communication between heterogeneous systems.

Validation:

XML documents can be validated against a Document Type Definition (DTD) or an XML Schema Definition (XSD). This ensures that the document adheres to a specific structure and set of rules.

Example:

                        <?xml version="1.0" encoding="UTF-8"?>
                        <bookstore>
                           <book category="Fiction">
                              <title>The Catcher in the Rye</title>
                              <author>J.D. Salinger</author>
                              <price>19.99</price>
                           </book>
                           <book category="Non-Fiction">
                              <title>Thinking, Fast and Slow</title>
                              <author>Daniel Kahneman</author>
                              <price>29.95</price>
                           </book>
                        </bookstore>