XML for RPG Programmers: An Introduction XML is the language of data interchange. It provides a powerful way to describe and encode data that is system independent. XML is quickly becoming the standard data interchange language for business-to-business applications. Along with its sister languages, XSLT and schemas, this skill is becoming a "must have" in today’s IT world. In this session you will learn what XML is, the basic syntax of each of these languages, and how it will likely affect your applications in the future.