/usr/share/mc/syntax/xml.syntax is in mc-data 3:4.8.19-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | # XML syntax highlighting
#
# Author: Petr Kozelka <pkozelka@email.cz>
# http://kozelka.hyperlink.cz
context default
keyword &*; white cyan
spellcheck
context <!-- --> brightgreen
spellcheck
context <! > yellow
keyword '+' brightcyan
keyword "+" brightcyan
keyword whole DOCTYPE white red
keyword whole PUBLIC brightred
keyword whole SYSTEM brightred
keyword whole NDATA brightred
keyword whole CDATA white
keyword whole #PCDATA white
keyword whole EMPTY white
keyword whole #REQUIRED white
keyword whole #IMPLIED white
keyword whole ELEMENT white
keyword whole ENTITY brightred
keyword whole ATTLIST white
keyword whole %*; white cyan
keyword \( lightgray
keyword \) lightgray
keyword \* lightgray
keyword \? lightgray
keyword \+ lightgray
keyword \| lightgray
keyword \, lightgray
spellcheck
context <\?xml \?> white red
context <\? \?> lightgray black
context < > white
keyword \sxmlns\:*\="+" brightred
keyword \sxmlns\="+" brightred
keyword \s*= yellow
keyword '*' brightcyan
keyword "*" brightcyan
spellcheck
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