<?xml version="1.0" ?>
<sdf version="1.8" xmlns:custom_ns="custom_ns_uri">
<world name="world_invalid_root_reference">
<model name="model1">
<pose>1 0 0 0 0 0</pose>
<link name="link1">
<sensor name="sensor1" type="imu">
<topic>__root__</topic> <!-- VALID __root__ is being used in a context where frame semantics does not apply -->
</sensor>
</link>
</model>
<frame name="frame1" custom_ns:attr1="__root__"/> <!-- VALID __root__ is being used in a custom attribute -->
<custom_ns:elem1 name="__root__" /> <!-- VALID __root__ is being used in a custom element -->
</world>
</sdf>
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