A document processor is a document preparation system that superficially resembles a word processor. However, the emphasis in a document processor is on the arrangement of the document's components,[1] not the formatting of the characters that compose it. The available tools are not just typical document elements—paragraphs, lists, headers—the primary attraction of a document processor is the ability to program documents with powerful conditional automatic formatting rules to create structured documents, which allow large numbers of similar elements to be generated and reformatted for different media with little human effort.
Examples of document processors include programs like PTC Arbortext, Adobe FrameMaker, LyX, BroadVision QuickSilver (formerly Interleaf), and Syntext Serna. Examples of markup languages used for non-graphical document processing include SGML/XML, LaTeX and troff.