/usr/share/nvim/runtime/syntax/docbksgml.vim is in neovim-runtime 0.2.2-3.
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 | " Vim syntax file
" Language: DocBook SGML
" Maintainer: Johannes Zellner <johannes@zellner.org>
" Last Change: Sam, 07 Sep 2002 17:20:46 CEST
let b:docbk_type="sgml"
runtime syntax/docbk.vim
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