Introduction
Transformations are used to filter and reorganize XML data into other XML data. Moreover, SAP proposes a special transformation called ID (as "identity") which transforms a variable into XML, or vice versa.
Transformations are maintained via the 
Transformation Editor (STRANS transaction). They may be called from ABAP programs via the CALL TRANSFORMATION transaction.
There are 2 transformation languages :
- XSL Transformations, created by W3C
- It is widely used by many programming languages
- It may be used to convert from XML to XML, and exchange between variable and XML. 2 transformations need to be created to convert from variable to XML, and from XML to variable
- It may be debugged via the Transformation Editor
- Simple Transformations, created by SAP
- It is used only for exchange between variable and XML, and is reversible (the same transformation may be used to convert a variable into XML, and to convert XML into a variable)
- It may NOT be debugged via the Transformation Editor
