This file is indexed.

/usr/share/sdformat/1.0/link.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.

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<!-- Link -->
<element name="link" required="+">
  <attribute name="name" type="string" default="__default__" required="1"/>
  <attribute name="gravity" type="bool" default="true" required="0"/>
  <attribute name="self_collide" type="bool" default="false" required="0"/>
  <attribute name="kinematic" type="bool" default="false" required="0"/>

  <element name="origin" required="0">
    <attribute name="pose" type="pose" default="0 0 0 0 0 0" required="1"/>
  </element> <!-- End Origin -->

  <element name="damping" required="1">
    <element name="linear" type="double" default="0.0" required="1"/>
    <element name="angular" type="double" default="0.0" required="1"/>
  </element> <!-- End damping -->

  <include filename="inertial.sdf" required="0"/>
  <include filename="collision.sdf" required="*"/>
  <include filename="visual.sdf" required="*"/>
  <include filename="sensor.sdf" required="*"/>
  <include filename="projector.sdf" required="*"/>

</element> <!-- End Link -->