This file is indexed.

/usr/share/mime/packages/calibre.xml is in calibre 2.5.0+dfsg-1.

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="x-content/ebook-reader">
    <comment>E-Book reader</comment>
    <treemagic>
      <treematch type="file" path="driveinfo.calibre"/>
    </treemagic>
  </mime-type>
</mime-info>