In ST programs, you use the statements tt:root, tt:parameter and tt:variable to declare the following data:
· Data roots to bind ABAP data
· Parameters as formal parameters
· Variables as local data
If these statements are specified outside of a template in the context of the transformation, the data declarations apply for the main template.
Within a subtemplate, the statements can be used in the element tt:context to declare local data of the subtemplate.