/usr/share/glib-2.0/schemas/org.gnome.gnome-panel.layout.top

<?xml version="1.0" encoding="UTF-8"?>
<schemalist gettext-domain="gnome-panel-3.0">

  <schema path="/org/gnome/gnome-panel/layout/toplevels/" id="org.gnome.gnome-panel.layout.toplevels">
    <child schema="org.gnome.gnome-panel.layout.toplevels.top-panel" name="top-panel"/>
    <child schema="org.gnome.gnome-panel.layout.toplevels.bottom-panel" name="bottom-panel"/>
  </schema>

  <schema id='org.gnome.gnome-panel.layout.toplevels.top-panel'>
    <key name='auto-hide' type='b'>
      <default>true</default>
    </key>
  </schema>

  <schema id='org.gnome.gnome-panel.layout.toplevels.bottom-panel'>
    <key name='auto-hide' type='b'>
      <default>true</default>
    </key>
  </schema>

</schemalist>