/usr/share/sdformat/1.3/root.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 7 8 9 10 11 12 13 | <element name="sdf" required="1">
<description>SDF base element.</description>
<attribute name="version" type="string" default="1.3" required="1">
<description>Version number of the SDF format.</description>
</attribute>
<include filename="world.sdf" required="*"/>
<include filename="model.sdf" required="*"/>
<include filename="actor.sdf" required="*"/>
<include filename="light.sdf" required="*"/>
</element> <!-- End SDF -->
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