This command performs an XSL: FO Transformation of an XML document containing XSL Formatting Object markup. XSL Formatting Objects let you specify document layout: margins, text direction, pagination etc. of your XML documents.
XML Spy uses Apache Software Foundation's FOP tool to transform the FO file.
You can output the FO file:
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Directly onto screen using the built-in FOP viewer
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or generate an output file enabling you to create a PDF file, a TXT file, an Area tree (XML), a MIF file, a PCL or PS (postscript) file.
This XSL:FO command generally operates on the currently active main window, but you can also right click any file, folder, or group of files in the active project window and select the XSL:FO Transformation command to transform and display or output the document.