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You can use a scenario's post-processing settings to specify that you want Stylus Studio to initiate processing on the result of applying a stylesheet. If you do, Stylus Studio performs the post-processing before it displays the result in the Preview window.
For example, you can choose to run the Apache Software Organization's Formatting Objects Processor (FOP) as a post-processor. You can run this on the result of stylesheets that generate XML documents that contain FO. The Apache FOP included with Stylus Studio converts FO XML into PDF and displays it in the Stylus Studio preview window. See Generating Formatting Objects.