This file is indexed.

/usr/share/sdformat/1.3/plugin.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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<!-- Plugin -->
<element name="plugin" required="*">
  <description>A plugin is a dynamically loaded chunk of code. It can exist as a child of world, model, and sensor.</description>
  <attribute name="name" type="string" default="__default__" required="1">
    <description>A unique name for the plugin, scoped to its parent.</description>
  </attribute>
  <attribute name="filename" type="string" default="__default__" required="1">
    <description>Name of the shared library to load. If the filename is not a full path name, the file will be searched for in the configuration paths.</description>
  </attribute>
  <element copy_data="true" required="*">
    <description>This is a special element that should not be specified in an SDF file. It automatically copies child elements into the SDF element so that a plugin can access the data.</description>
  </element>
</element> <!-- End Plugin -->