PDF/VT
PDF/VT is an exchange format for graphically demanding mass printing or variable data printing or transaction printing. The format is based on PDF/X-4 and is intended to establish itself as an alternative to PPML and AFP. Compared to these formats, it offers better image representation (including transparency and device-independent color coding) and is compatible with Adobe Reader. PDF/VT is compatible with PDF/A (for lossless archiving).