fop.extensions boolean fop.extensions Enable extensions for FOP version 0.20.5 and earlier If non-zero, extensions intended for FOP version 0.20.5 and earlier will be used. At present, this consists of PDF bookmarks. This parameter can also affect which graphics file formats are supported. If you are using a version of FOP beyond version 0.20.5, then use the fop1.extensions parameter instead.