/usr/share/sdformat/1.0/collision.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 14 15 16 | <!-- Collision -->
<element name="collision" required="*">
<attribute name="name" type="string" default="__default__" required="1"/>
<attribute name="laser_retro" type="double" default="0" required="0"/>
<element name="max_contacts" type="int" default="10" required="0"/>
<element name="mass" type="double" default="0" required="0"/>
<element name="origin" required="0">
<attribute name="pose" type="pose" default="0 0 0 0 0 0" required="1"/>
</element> <!-- End Origin -->
<include filename="geometry.sdf" required="1"/>
<include filename="surface.sdf" required="0"/>
</element> <!-- End Collision -->
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