XSL-FO is a language for formatting XML data. In the case of Oracle APEX it is used for converting data to PDF files. Here you can find a good XSL-FO tutorial
Apache FOP is an engine that processes XSL-FO files. APEX sends the data to the print server in XML format and Apache FOP converts it to PDF.
The designer is a visual tool for creating XSL-FO files. You can use it without previous knowledge of XSL-FO. It has been developed for Apache FOP.
No, you have the following options:
- Use Oracle ORDS (*)
- Use our own standalone server
- Use our PDF generation service
- Use your current print server, as long as it uses Apache FOP (*)
* In this case you cannot use the extended features