The PFTemplateBoundary tag can be used to specify a canvas/print area (independent of the page format created in InDesign) within an InDesign document.
If the InDesign template uploaded in printformer contains a block tagged as PFTemplateBoundary , it will be reduced to the size of this boundary in the editor/print PDF. (All elements outside the block are ignored in the printformer editor and the page format is trimmed accordingly).
any coordinates are set relative to the PFTemplateBoundary
the background PDF is also cropped to the size and position of the PFTemplateBoundary block
if there are multiple blocks tagged as PFTemplateBoundary in the InDesign document, only the first block will be used and the rest will be discarded.