This file is indexed.

/usr/share/sdformat/1.0/world.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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<element name="world" required="*">
  <attribute name="name" type="string" default="__default__" required="1"/>

  <include filename="gui.sdf" required="0"/>
  <include filename="physics.sdf" required="1"/>
  <include filename="scene.sdf" required="1"/>
  <include filename="light.sdf" required="*"/>

  <include filename="model.sdf" required="*"/>
  <include filename="actor.sdf" required="*"/>
  <include filename="plugin.sdf" required="*"/>
  <include filename="joint.sdf" required="*"/>
  <include filename="road.sdf" required="*"/>

  <include filename="state.sdf" required="*"/>
</element> <!-- End World -->