ledpar/polyglossia/kannada example

\documentclass[12pt, a4paper, twoside]{article}
\usepackage{etex, fontspec, parskip}

\usepackage{polyglossia}
\setdefaultlanguage{kannada}
\setotherlanguage{english}
\setmainfont[Script=Kannada]{Tunga}
\newfontfamily\englishfont{Times}
\newcommand{\en}[1]{\textenglish{#1}}

% \usepackage{ledmac, ledpar}
% The above does not work.
% See: enrico . gregorio, "Re: [XeTeX] polyglossia and ledpar conflict",
% http://www.mail-archive.com/xetex@tug.org/msg00928.html
\letcs\POLYselectlanguage{\string\selectlanguage}
\usepackage{ledmac}
\usepackage{ledpar}
\AtBeginDocument{
\renewcommand{\selectlanguage}[2][]{%
   \POLYselectlanguage[#1]{#2}%
   \ifledRcol
     \gdef\theledlanguageR{#2}%
   \else
     \gdef\theledlanguageL{#2}%
  \fi}
}
\linenummargin{inner}
\sidenotemargin{inner}
\maxchunks{20}

\usepackage[driver=xetex, outer=1in, inner=1in, bottom=1in]{geometry}
\setlength{\parindent}{-1em}

\newcounter{paral}
\setcounter{paral}{0}
\newcounter{parar}
\setcounter{parar}{0}
%\newcommand{\pn}[1]{\pstart #1 \\ \pend}
% \newcommand{\pl}[1]{\addtocounter{paral}{1}\pstart\arabic{paral} #1 \\ \pend}
% \newcommand{\pr}[1]{\addtocounter{parar}{1}\pstart\arabic{parar} #1 \\ \pend}
\newcommand{\sect}[1]{\pstart\centering{{\Large #1}} \\\pend}
\newcommand{\pdl}[2]{\expandafter\def\csname pul#1\endcsname{\addtocounter{paral}{1}\pstart\arabic{paral} #2 \\ \pend}}
\newcommand{\pdr}[2]{\expandafter\def\csname pur#1\endcsname{\addtocounter{parar}{1}\pstart\arabic{parar} #2 \\ \pend}}
% "d" for "define", "u" for "use".

%%%%%%%%%%%%%%%%%%%%%%% actual text begins here %%%%%%%%%%%%%%%%%%%%%%%

\pdl{a}{ಒಂದನೆಯ ಎಡ ಐಟಮ್ಮು}
\pdr{a}{ಒಂದನೆಯ ಬಲ ಐಟಮ್ಮು}

\pdl{b}{ಎರಡನೆಯ ಎಡ ಐಟಮ್ಮು}
\pdr{b}{ಎರಡನೆಯ ಬಲ ಐಟಮ್ಮು}

\pdl{c}{ಮೂರನೆಯ ಎಡ ಐಟಮ್ಮು}
\pdr{c}{ಮೂರನೆಯ ಬಲ ಐಟಮ್ಮು}

% [snip] -- All the paragraphs in between are omitted

\pdl{bq}{ಕೊನೆಯ ಎಡ ಐಟಮ್ಮು}
\pdr{bq}{ಕೊನೆಯ ಬಲ ಐಟಮ್ಮು}

%%%%%%%%%%%%%%%%%%%%%%% actual text ends here %%%%%%%%%%%%%%%%%%%%%%%

\author{}\title{}\date{}
\begin{document}
\maketitle

\begin{pages}

\begin{Leftside}\firstlinenum{100000}\beginnumbering
\sect{ಈ ಲೇಖನದ ಹೆಸರು}
\pula \pulb \pulc \puld \pule \pulf \pulg \pulh \puli \pulj \pulk \pull \pulm \puln
\endnumbering\end{Leftside}
\begin{Rightside}\firstlinenum{100000}\beginnumbering
\sect{ಈ ಲೇಖನದ ಬಲ ಹೆಸರು}
\pura \purb \purc \purd \pure \purf \purg \purh \puri \purj \purk \purl \purm \purn
\endnumbering\end{Rightside}
\Pages

\begin{Leftside}\beginnumbering
\pulo \pulp \pulq \pulr \puls \pult \pulu \pulv \pulw \pulx \puly \pulz \pulaa
\endnumbering\end{Leftside}
\begin{Rightside}\beginnumbering
\puro \purp \purq \purr \purs \purt \puru \purv \purw \purx \pury \purz \puraa
\endnumbering\end{Rightside}
\Pages

\begin{Leftside}\beginnumbering
\pulab \pulac \pulad \pulae \pulaf \pulag \pulah \pulai \pulaj \pulak \pulal \pulam
\endnumbering\end{Leftside}
\begin{Rightside}\beginnumbering
\purab \purac \purad \purae \puraf \purag \purah \purai \puraj \purak \pural \puram
\endnumbering\end{Rightside}
\Pages

% [snip] Two pages omitted

\begin{Leftside}\beginnumbering
\pulbj \pulbk \pulbl \pulbm \pulbn \pulbo \pulbp \pulbq
\endnumbering\end{Leftside}
\begin{Rightside}\beginnumbering
\purbj \purbk \purbl \purbm \purbn \purbo \purbp \purbq
\endnumbering\end{Rightside}
\Pages


\end{pages}

\end{document}