For a very long time, pdfToolbox has supported a full imposition engine, that was driven entirely by using three types of files:
- Sheet configuration files (extension .sheetconfig) to define the dimensions of imposed sheets and to define slots (rectangular areas on those sheets where information could be placed).
- Runlist files (extension .runlist) to define how the pages of an incoming file should be placed on the imposed sheets.
- Background files (extension .sheetconfig.pdf) to provide a background onto which to impose the information as stated in the sheet configuration and runlist files. This is an optional file; if it's not there the imposition happens on blank sheets.
The sheet configuration and runlist files use a tab-delimited format using callas specific keywords and functions.
And background files continue to function as before.