XML
The Extensible Markup Language (XML) is a general-purpose specification for creating custom markup languages.[1] It is classified as an extensible language because it allows its users to define their own elements. Its primary purpose is to facilitate the sharing of structured data across different information systems, particularly via the Internet,[2] and it is used both to encode documents and to serilize data. In the latter context, it is comparable with other text-based serialization languages such as JSON and YAML
XML > APPLİCATİONS
Commerce XML - Formats for common business transactions with DTDs, manual, samples, and user guide.
http://www.cxml.org/
ZapThink XML Standards Report - The most up-to-date, authoritative, exhaustive report of all 350+ XML Standards that have shaped the industry to date.
http://www.zapthink.com/
Resources for XML applied to EDI. - A list of links to webs related to the application of XML to EDI.
http://www.xml.com/pub/pt/11