XML is at the heart of a number of developments that are likely to become basic technology standards, such as Web services. In turn, the ability to move data between XML documents and your ABAP data structures is becoming a key business requirement. While middleware like the SAP Exchange Infrastructure supports this task for large-scale system integration projects, SAP also provides mapping technology directly to ABAP developers for smaller-scale development tasks. This article introduces Simple Transformations, a special-purpose language included in the 6.40 ABAP kernel that enables high-performance ABAP-XML mappings. It outlines the fundamental concepts of the language, and provides a detailed tour of its key constructs.