/usr/share/devhelp/dtd/devhelp-1.dtd is in devhelp-common 3.18.1-1ubuntu5.
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 | <?xml version ="1.0" ?>
<!ELEMENT book (chapters,functions?)>
<!ATTLIST book title CDATA #REQUIRED
name CDATA #REQUIRED
base CDATA #IMPLIED
version CDATA #IMPLIED
link CDATA #REQUIRED
author CDATA #IMPLIED>
<!ELEMENT chapters (sub*,chapter*)>
<!ELEMENT chapter (sub*,chapter*)>
<!ATTLIST chapter name CDATA #REQUIRED
link CDATA #REQUIRED>
<!ELEMENT sub (sub*,chapter*)>
<!ATTLIST sub name CDATA #REQUIRED
link CDATA #REQUIRED>
<!ELEMENT functions (function+)>
<!ELEMENT function EMPTY>
<!ATTLIST function name CDATA #REQUIRED
link CDATA #REQUIRED>
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