/usr/share/gtksourceview-3.0/language-specs/language.dtd is in libgtksourceview-3.0-common 3.18.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is part of GtkSourceView
Copyright (C) 2006 Paolo Maggi <paolo@gnome.org>
Copyright (C) 2006 Leonardo Ferreira Fontenelle <leo.fontenelle@gmail.com>
gtksourceview is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
gtksourceview is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-->
<!-- FIXME: the "name" attribute can be "_name" to be marked for translation -->
<!ENTITY % itemattrs
"name CDATA #REQUIRED
style CDATA #REQUIRED">
<!ELEMENT language (escape-char?,(line-comment|block-comment|string|syntax-item|pattern-item|keyword-list)+)>
<!-- FIXME: the "name" and "section" attributes can be prefixed with
"_" to be marked for translation -->
<!ATTLIST language
name CDATA #REQUIRED
version CDATA #REQUIRED
section CDATA #REQUIRED
translation-domain CDATA #IMPLIED
mimetypes CDATA #REQUIRED>
<!ELEMENT escape-char (#PCDATA)>
<!ELEMENT line-comment (start-regex)>
<!ATTLIST line-comment
%itemattrs;>
<!ELEMENT block-comment (start-regex,end-regex)>
<!ATTLIST block-comment
%itemattrs;>
<!ELEMENT string (start-regex,end-regex)>
<!ATTLIST string
%itemattrs;
end-at-line-end (true|false) "true">
<!ELEMENT syntax-item (start-regex,end-regex)>
<!ATTLIST syntax-item
%itemattrs;>
<!ELEMENT pattern-item (regex)>
<!ATTLIST pattern-item
%itemattrs;>
<!ELEMENT keyword-list (keyword+)>
<!ATTLIST keyword-list
%itemattrs;
case-sensitive (true|false) "true"
match-empty-string-at-beginning (true|false) "false"
match-empty-string-at-end (true|false) "false"
beginning-regex CDATA #IMPLIED
end-regex CDATA #IMPLIED>
<!ELEMENT start-regex (#PCDATA)>
<!ELEMENT end-regex (#PCDATA)>
<!ELEMENT regex (#PCDATA)>
<!ELEMENT keyword (#PCDATA)>
|