Automation Engine 12.2 introduced "Step & Repeat Tabular (Dynamic)" and "Step & Repeat Template based (Dynamic)" tasks.
These tasks are able to handle multiple input files at once and assign them to individual step and repeat grids. Input files are paired with grids based on a simple rule: the first grid is filled by the first input file, the second grid is filled by the second input file and so on.
This rule works fine for the majority of use cases but cannot handle the following cases:
Use multiple files to fill single step and repeat grid
Specify page range for multi-page input file to be used in your job
Specify how many times you want to repeat the pages
The XML input file format was specified in order to address issues mentioned above. The XML file format allows specifying a run list which will be used for one step and repeat grid. The XML file will be paired with the grid using the simple rule described above.