1. A system comprising: a memory that stores rules for prioritizing Job Definition Format (JDF) instructions; and a controller operable to receive a print job, to identify multiple sets of JDF instructions for the print job, to create a merged set of JDF instructions from the JDF instructions in each of the identified sets, to identify conflicts within the merged set between JDF instructions that share page ranges with each other, and to resolve the conflicts by altering the merged set of JDF instructions based on the rules stored in memory, wherein the multiple sets of JDF instructions include a set of JDF instructions received at the system and a set of JDF instructions generated by the system, and wherein the rules define whether received JDF instructions take priority over generated JDF instructions.