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+% This file is public domain.
+%
+% This example document demonstrates the testidx package
+% with LuaLaTeX and xindy. You can build this document using:
+%
+% lualatex sample-idx-lua
+% xindy -M sample-idx-lua -M texindy -C utf8 -L english -t sample-idx-lua.ilg sample-idx-lua.idx
+% lualatex sample-idx-lua
+%
+% If you are using arara, the directives are:
+%
+% arara: lualatex
+% arara: xindy: {language: english, codepage: utf8,
+% arara: --> log: sample-idx-lua.ilg,
+% arara: --> modules: [basename, texindy]}
+% arara: lualatex
+\documentclass{article}
+
+\usepackage{filecontents}
+\usepackage{fontspec}
+\usepackage{makeidx}
+\usepackage{testidx}
+
+% Create the .xdy file for this example:
+\begin{filecontents*}{\jobname.xdy}
+; list of allowed attributes
+
+(define-attributes ((
+  "tstidxencapi"
+  "tstidxencapii"
+  "tstidxencapiii"
+)))
+
+; define format to use for locations
+
+(markup-locref :open "\tstidxencapi{"
+ :close "}"
+ :attr "tstidxencapi")
+
+(markup-locref :open "\tstidxencapii{"
+ :close "}"
+ :attr "tstidxencapii")
+
+(markup-locref :open "\tstidxencapiii{"
+ :close "}"
+ :attr "tstidxencapiii")
+
+(markup-locref-list :sep ",")
+(markup-range :sep "--")
+
+; define a numbers group
+
+(define-letter-group "Numbers"
+   :prefixes ("0" "1" "2" "3" "4" "5" "6" "7" "8" "9")
+   :before "A")
+
+; define a "Maths" group for keys starting with ">"
+
+(define-letter-group "Maths"
+   :prefixes (">" )
+   :before "Numbers")
+
+; define a "Markers" group for keys starting with "<"
+
+(define-letter-group "Markers"
+   :prefixes ("<" )
+   :before "Maths")
+
+\end{filecontents*}
+
+\makeindex
+
+\begin{document}
+\testidx
+
+\printindex
+\end{document}
+