/usr/share/sgml/dtd/deprec96 is in linuxdoc-tools 0.9.67ubuntu1.
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 | <!-- ================================================= -->
<!-- Former verbose environments: tscreen, verb. -->
<!-- BK: a redundant, confusing mess? -->
<!-- ================================================= -->
<!element verb - - rcdata>
<!element tscreen - - ((%inline; | %sectpar;)*, p*)+ >
<!-- ================================================= -->
<!-- FONT ELEMENTS for highlighting -->
<!-- BK: deprecated,
but unfortunately part of Linuxdoc -->
<!-- ================================================= -->
<!element em - - (%inline)>
<!element bf - - (%inline)>
<!element tt - - (%inline)>
<!usemap ttmap tt>
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