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How XML Structures Data for Flexible Exchange

The Extensible Markup Language (XML) allows you to create your own markup language, or "customise" tags to describe the data you store, format, and transfer between systems. Because there are no restrictions on the names of the tags that can be used, XML is flexible and adaptable to many different types of use cases. 

An XML document consists of a hierarchy of elements (tags), starting with a root element and then containing child elements that can be nested within the root element. XML allows software applications to safely communicate and exchange information consistently with each other regardless of the software application or operating system being used. XML is commonly used for configuration files, web services, document formats (e.g., DOCX and SVG), and enterprise applications, especially when it is critical to follow certain data format rules/standards. 

Developers use schema definitions (e.g., Document Type Definitions [DTD] and XML Schema Definitions [XSD]) to enforce rules/constraints and validate XML data to ensure that it is well-formed and valid. Even though JSON has emerged as the preferred option for simple web applications, XML will continue to be a major factor in industries that require complex workflows, hierarchical data sets, and strict validation. The long-term support and standardisation of XML as a technology make it an important player in systems integration and data interchange solutions.