/usr/share/xml/docbook/custom/website/2.5.0/schema/dtd/extensions.mod is in docbook-website 2.5.0.0-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!-- Website Extensions V2.5.0
Copyright (C) 2002 Norman Walsh
http://sourceforge.net/projects/docbook/
$Id: extensions.mod,v 1.3 2003/06/22 16:56:06 nwalsh Exp $
Please direct all questions and comments about this DTD to
Norman Walsh, <ndw@nwalsh.com>.
-->
<!-- ====================================================================== -->
<!-- allow webtoc to occur anywhere a para can occur -->
<!ENTITY % local.para.class "|webtoc|rss">
<!ENTITY % namespaces.mod
PUBLIC "-//Norman Walsh//DTD Website Namespaces Module V2.5.0//EN"
"namespaces.mod">
%namespaces.mod;
<!-- RDDL? -->
<!ENTITY % allowrddl "INCLUDE">
<![%allowrddl;[
<!ENTITY % rddl.elements "|%rddl-resource.element;">
<!ENTITY % local.section.attrib
"rddl IDREF #IMPLIED"
>
]]>
<!ENTITY % rddl.elements "">
<!-- Forms? -->
<!ENTITY % allowforms "INCLUDE">
<![%allowforms;[
<!ENTITY % local.para.char.mix "|%html-input.element;|%html-button.element;|%html-label.element;|%html-select.element;|%html-textarea.element; %rddl.elements;">
<!ENTITY % local.divcomponent.mix "|%html-form.element;">
]]>
<!ENTITY % local.para.char.mix "%rddl.elements;">
<!-- the XML notation; this really should go in DocBook -->
<!NOTATION XML SYSTEM "http://www.w3.org/TR/REC-xml">
<!ENTITY % local.notation.class "">
<!ENTITY % notation.class
"BMP| CGM-CHAR | CGM-BINARY | CGM-CLEAR | DITROFF | DVI
| EPS | EQN | FAX | GIF | GIF87a | GIF89a
| JPG | JPEG | IGES | PCX
| PIC | PNG | PS | SGML | XML | TBL | TEX | TIFF | WMF | WPG
| linespecific
%local.notation.class;">
<!-- End of Website Extensions V2.5.0 ..................................... -->
<!-- ...................................................................... -->
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