Arbortext Advanced Print Publisher (APP, formerly Advent 3B2) is commercial typesetting software application sold by Parametric Technology Corporation.
The software contains an automated publishing engine that can manually or automatically produce Postscript and PDF documents with complex page layouts.
APP supports processing of marked-up text such as SGML, XML and HTML natively, using a JavaScript based Formatting Object Model API and/or its own proprietary scripting languages and established technologies such as Perl, XPath and Unicode.
Its rules-based engine allows the stylesheet builder to automate demanding page make-up tasks and run them in a 'lights out' server mode.
APP applies text and page formatting properties with any chevron delimited mark-up such as SGML or XML or non well formed markup.