/usr/lib/tcltk/tdom0.8.3/pkgIndex.tcl is in tdom 0.8.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | package ifneeded tdom 0.8.3 \
"load [list [file join $dir libtdom0.8.3.so]];\
source [list [file join $dir tdom.tcl]]"
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