XML Format Guide

About XML Format

XML (Extensible Markup Language) is a W3C standard markup language designed for storing and transporting structured data. Created in 1996 by Jon Bosak and the W3C XML Working Group, XML was derived from SGML (Standard Generalized Markup Language) with the goal of being both human-readable and machine-readable. It became a W3C Recommendation in 1998 and quickly became the dominant data interchange format for enterprise systems.

XML uses self-describing tags organized in a strict hierarchical tree structure. Unlike HTML, XML tags are not predefined — users create their own vocabulary to describe data. XML supports namespaces for mixing vocabularies, schema validation (DTD, XSD, RELAX NG), and powerful transformation capabilities through XSLT. It remains widely used in enterprise integration (SOAP web services), configuration files (Maven pom.xml, Spring, Android manifests), document formats (XHTML, SVG, DOCX internals, RSS/Atom), and industry-specific standards (HL7 for healthcare, XBRL for finance, FpML for derivatives).

Available Conversions

XML Features

• W3C Standard: XML 1.0 (5th Edition) and XML 1.1, universally supported across platforms
• Self-Describing Tags: User-defined element and attribute names that describe the data
• Hierarchical Structure: Strict tree-based nesting for complex data relationships
• Namespace Support: Mix multiple vocabularies in a single document without conflicts
• Schema Validation: DTD, XML Schema (XSD), and RELAX NG for structure enforcement
• XSLT Transformations: Powerful stylesheet language to transform XML into other formats
• XPath/XQuery: Query languages for navigating and extracting data from XML trees
• Unicode Support: Full UTF-8 and UTF-16 encoding with explicit declaration
• CDATA Sections: Embed raw content without escaping special characters
• Processing Instructions: Embed application-specific instructions within documents

Common Uses

• Enterprise Integration: SOAP web services, ESB message formats, B2B data exchange
• Configuration Files: Maven pom.xml, Spring applicationContext.xml, Android manifests, web.xml
• Document Formats: XHTML, SVG, MathML, Office Open XML (DOCX/XLSX/PPTX internals)
• Web Feeds: RSS 2.0 and Atom syndication for news and blog content distribution
• Sitemaps: XML sitemaps for search engine optimization (SEO)
• Financial Standards: XBRL for financial reporting, FpML for derivatives, FIX protocol
• Healthcare: HL7 messaging, FHIR resources, CDA clinical documents
• Publishing: DocBook for technical documentation, DITA for modular content