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