This file is indexed.

/usr/share/source-highlight/xml.lang is in libsource-highlight-common 3.1.8-1.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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state preproc delim "<?xml" "?>" multiline begin
	include "key_string.lang"
end

state preproc delim '<![[:alpha:]]+' ">" multiline begin
	include "key_string.lang"
end

comment delim "<!--" "-->" multiline nested

keyword = '<(/)?[[:alpha:]]([[:word:]:.-]*)(/)?>'

state keyword delim '<(/)?[[:alpha:]]([[:word:]:.-]*)' '(/)?>' multiline begin
	include "key_string.lang"
end

preproc = '&([[:alnum:]]+);'