This file is indexed.

/usr/share/glib-2.0/schemas/org.mate.hud.gschema.xml is in mate-hud 18.04.8-0ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<schemalist>
  <schema id="org.mate.hud" path="/org/mate/hud/">
    <key type="b" name="enabled">
      <default>true</default>
      <summary>Enable MATE HUD.</summary>
      <description>If true, MATE HUD will run when invoked.</description>
    </key>
    <key type="s" name="shortcut">
      <default>'Alt_L'</default>
      <summary>The keyboard shortcut used to pop-up the MATE HUD</summary>
      <description>
        The format looks like "<![CDATA[<Control>a]]>" or "<![CDATA[<Shift><Alt>F1]]>".
        The parser is fairly liberal and allows lower or upper case, and also abbreviations such as "<![CDATA[<Ctl>]]>" and "<![CDATA[<Ctrl>]]>".
      </description>
    </key>
    <key type="i" name="tap-timeout">
      <default>250</default>
      <summary>The timeout between key press and release to determine if the user meant to open MATE HUD</summary>
      <description>
        This only applies to single key shortcuts (e.g. `Alt_L`). It prevents the HUD from showing up if the user keeps the shortcut pressed for longer than the timeout.
        Set to 0 to disable the timeout.
      </description>
    </key>
  </schema>
</schemalist>