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/usr/share/xindy/rules/isolatin1-tolower.xdy is in xindy-rules 2.5.1.20160104-4build1.

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;; isolatin1-tolower			Roger Kehr	 14 Jan 98
;;----------------------------------------------------------------------

;; This style maps all uppercase letters of the ISO Latin1 alphabet
;; in the range 160-255 to their lowercase counterparts.

(require "rules/latin-tolower.xdy")

(define-rule-set "isolatin1-tolower"

  :inherit-from ("latin-tolower")

  :rules (("À" "à" :string :again)
	  ("Á" "á" :string :again)
	  ("Â" "â" :string :again)
	  ("Ã" "ã" :string :again)
	  ("Ä" "ä" :string :again)
	  ("Å" "å" :string :again)
	  ("Æ" "æ" :string :again)

	  ("Ç" "ç" :string :again)

	  ("È" "è" :string :again)
	  ("É" "é" :string :again)
	  ("Ê" "ê" :string :again)
	  ("Ë" "ë" :string :again)

	  ("Ì" "ì" :string :again)
	  ("Í" "í" :string :again)
	  ("Î" "î" :string :again)
	  ("Ï" "ï" :string :again)

	  ("Ð" "ð" :string :again)
	  ("Ñ" "ñ" :string :again)

	  ("Ò" "ò" :string :again)
	  ("Ó" "ó" :string :again)
	  ("Ô" "ô" :string :again)
	  ("Õ" "õ" :string :again)
	  ("Ö" "ö" :string :again)
	  ("Ø" "ø" :string :again)

	  ("Ù" "ù" :string :again)
	  ("Ú" "ú" :string :again)
	  ("Û" "û" :string :again)
	  ("Ü" "ü" :string :again)

	  ("Ý" "ý" :string :again)
	  ("Þ" "þ" :string :again)
	  ))

;; End