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XF is a letter grade used at some U.S. colleges, to denote either students who withdraw from a course after the refund period has lapsed [1][2] or who are caught performing acts of academic dishonesty.
History & Development of the XFDL File Format. XFDL is based on the Universal Forms Description Language (UFDL). Developed in the mid-1990s, UFDL was a robust language for working with forms. XFDL is, essentially, a version of UFDL converted to XML syntax.