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Extensible Markup Language for structured data. Used in configuration files, web services (SOAP), and document formats.
The World Wide Web Consortium (W3C) published the XML 1.0 specification in 1998, creating an extensible markup language designed to be both human-readable and machine-parseable. XML's self-describing tag structure — where element names carry semantic meaning and attributes provide metadata — made it the foundation of enterprise data exchange for over two decades. SOAP web services, RSS and Atom feeds, SVG graphics, XHTML, Office Open XML (docx/xlsx/pptx), Android layout files, Maven POM configurations, and Spring Framework bean definitions all use XML.
The format supports namespaces for avoiding naming conflicts in combined documents, DTD and XSD schemas for document validation, XSLT for transforming documents between formats, and XPath/XQuery for querying document contents. XML's tree structure — a single root element containing nested child elements with attributes — provides a rigorous hierarchical data model that supports mixed content (text interleaved with child elements), processing instructions, and CDATA sections for embedded data. While JSON has replaced XML for most web API communication, XML remains dominant in enterprise integration (EDI, HL7 for healthcare, FIXML for financial services), configuration management, document publishing (DocBook, DITA), and government data interchange.
The extensive tooling ecosystem includes validators, schema editors, XSLT processors, and XPath evaluators in every major programming language. XML comparison benefits from tree-based structural diffing that understands element hierarchy, attribute ordering, namespace prefixes, and text node content — providing semantic comparison that text-based diff cannot achieve for deeply nested documents.
XML's deeply nested tree structure means that structural comparison — matching elements by tag name and position, comparing attributes independently, and understanding namespace context — provides far more useful results than line-by-line text diff. Structural XML comparison catches reordered elements that are semantically equivalent, attribute changes without affected element relocation, namespace prefix modifications that don't change meaning, and deep nesting changes that text diff shows as massive blocks of moved content.
Teams diff XML for Spring configuration reviews, Maven dependency audits, and SOAP message debugging.
UtraDiff performs a DOM tree diff on XML files, matching elements by tag name and attributes rather than line position. Reordered sibling elements with distinct identifiers are recognized as moves rather than delete-plus-insert pairs. Attribute changes, namespace modifications, and text node edits are highlighted individually in the tree view.
The text diff with XML syntax highlighting runs in parallel. Cross-format comparison supports diffing XML against HTML and SVG within the markup compatibility group.
Supported extensions: .xml