This file is indexed.

/usr/share/Yap/pl/udi.yap is in yap 6.2.2-6+b2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/*************************************************************************
*									 *
*	 YAP Prolog 							 *
*									 *
*	Yap Prolog was developed at NCCUP - Universidade do Porto	 *
*									 *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-2010	 *
*									 *
**************************************************************************
*									 *
* File:		udi.yap							 *
* Last rev:	8/2/88							 *
* mods:									 *
* comments:	support user defined indexing				 *
*									 *
*************************************************************************/

:- meta_predicate udi(:).

/******************
*     udi/1     *
******************/

udi(Pred) :-
   '$udi_init'(rtree, Pred).