1. A non-transitory machine readable storage medium containing stored program code that when processed by a processor of a printer causes a method to be performed, comprising: applying one or more properties included in a Job Definition Format (JDF) job ticket to a series of pages to produce a next sheet of document to be printed; comparing substantive content of the sheet to respective substantive sheet content for a group of one or more previously generated sheets of the document that each contain the respective sheet content; and, referencing the sheet to the group because the substantive content matched the respective substantive sheet content.