/usr/share/sdformat/1.4/forcetorque.sdf is in sdformat-sdf 2.0.0-6.
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 | <element name="force_torque" required="0">
<description>These elements are specific to the force torque sensor.</description>
<element name="frame" type="string" default="parent" required="0">
<description>Frame in which to report the wrench values.</description>
</element>
</element>
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