.FO File Extension

Formatting Objects Form that saves data in a standard XML format; XSL-FO (also called XSL) is a markup language that defines how XML data is formatted for the screen, print, or other type of media.

Because XSL-FO forms use standard XML formatting, data entered into XSL-FO forms can be integrated with any database that supports XML. Data can be collected online or offline and forms may include security features and form validation.

XSL-FO stands for "Extensible Stylesheet Language - Formatting Objects."