This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.gnome-panel.menu-button.gschema.xml is in gnome-panel-data 1:3.8.0-1ubuntu11.

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"?>
<schemalist gettext-domain="gnome-panel-3.0">
  <schema id="org.gnome.gnome-panel.menu-button">
    <key type="s" name="tooltip">
      <default>''</default>
      <summary>Tooltip displayed for menu</summary>
      <description>The text to display in a tooltip for this menu.</description>
    </key>
    <key type="s" name="custom-icon">
      <default>''</default>
      <summary>Icon used for button</summary>
      <description>The location of the image file used as the icon for the object's button. If empty, the default icon for the menu will be used.</description>
    </key>
    <key type="s" name="menu-path">
      <default>''</default>
      <summary>Menu content path</summary>
      <description>The path from which the menu contents is contructed. If empty, the menu will be the default applications menu.</description>
    </key>
  </schema>
</schemalist>