This file is indexed.

/usr/share/mime/packages/referencer.xml is in referencer 1.2.2-1build2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
   <mime-type type="application/x-referencer">
	 <sub-class-of type="application/xml"/>
     <comment>Referencer Library</comment>
     <magic priority="50">
       <match value="&lt;library" type="string" offset="0:64"/>
     </magic>
     <glob pattern="*.reflib"/>
   </mime-type>
</mime-info>