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/usr/share/xindy/styles/basic.xdy is in xindy-rules 2.4-1.1.

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;; $Id: basic.xdy,v 1.2 2008/01/09 15:13:54 jschrod Exp $ -*- Lisp -*-
;; ------------------------------------------------------------
;; (history at end)
;; Licensed under GPL, see README and LICENSE.


;;;
;;; Very basic xindy style, to get some TeX-like output at all.
;;; Useful for testing without the whole texindy framework.
;;; It assumes the alphabets to be handled elsewhere, by language modules.
;;;

(define-location-class "page-numbers" ("arabic-numbers"))
(define-attributes ("default"))

(markup-letter-group :open-head "~n~n  \textbf{" :close-head "}~n"
                     :capitalize)

(markup-indexentry :open "~n  \item "           :depth 0)
(markup-indexentry :open "~n    \subitem "      :depth 1)
(markup-indexentry :open "~n      \subsubitem " :depth 2)

(markup-locclass-list :open "\quad ")
(markup-locref-list :sep ", ")
(markup-range :sep "--")


;======================================================================
;;
;; $Log: basic.xdy,v $
;; Revision 1.2  2008/01/09 15:13:54  jschrod
;;     Add another newline in front of letter groups.
;;
;; Revision 1.1  2006/08/05 15:58:11  jschrod
;;     Initial revision.
;;