/usr/share/vim/vim80/syntax/rnc.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
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 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | " Vim syntax file
" Language: Relax NG compact syntax
" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
" Latest Revision: 2007-06-17
if exists("b:current_syntax")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
setlocal iskeyword+=-,.
syn keyword rncTodo contained TODO FIXME XXX NOTE
syn region rncComment display oneline start='^\s*#' end='$'
\ contains=rncTodo,@Spell
syn match rncOperator display '[-|,&+?*~]'
syn match rncOperator display '\%(|&\)\=='
syn match rncOperator display '>>'
syn match rncNamespace display '\<\k\+:'
syn match rncQuoted display '\\\k\+\>'
syn match rncSpecial display '\\x{\x\+}'
syn region rncAnnotation transparent start='\[' end='\]'
\ contains=ALLBUT,rncComment,rncTodo
syn region rncLiteral display oneline start=+"+ end=+"+
\ contains=rncSpecial
syn region rncLiteral display oneline start=+'+ end=+'+
syn region rncLiteral display oneline start=+"""+ end=+"""+
\ contains=rncSpecial
syn region rncLiteral display oneline start=+'''+ end=+'''+
syn match rncDelimiter display '[{},()]'
syn keyword rncKeyword datatypes default div empty external grammar
syn keyword rncKeyword include inherit list mixed name namespace
syn keyword rncKeyword notAllowed parent start string text token
syn match rncIdentifier display '\k\+\_s*\%(=\|&=\||=\)\@='
\ nextgroup=rncOperator
syn keyword rncKeyword element attribute
\ nextgroup=rncIdName skipwhite skipempty
syn match rncIdName contained '\k\+'
hi def link rncTodo Todo
hi def link rncComment Comment
hi def link rncOperator Operator
hi def link rncNamespace Identifier
hi def link rncQuoted Special
hi def link rncSpecial SpecialChar
hi def link rncAnnotation Special
hi def link rncLiteral String
hi def link rncDelimiter Delimiter
hi def link rncKeyword Keyword
hi def link rncIdentifier Identifier
hi def link rncIdName Identifier
let b:current_syntax = "rnc"
let &cpo = s:cpo_save
unlet s:cpo_save
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