This file is indexed.

/usr/share/gdm/gdm.schemas is in gdm3 3.18.3-0ubuntu2.

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

The actual contents of the file can be viewed below.

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<gdmschemafile>
  <schemalist>

    <schema>
      <key>chooser/Multicast</key>
      <signature>b</signature>
      <default>false</default>
    </schema>
    <schema>
      <key>chooser/MulticastAddr</key>
      <signature>s</signature>
      <default>ff02::1</default>
    </schema>

    <schema>
      <key>daemon/User</key>
      <signature>s</signature>
      <default>gdm</default>
    </schema>
    <schema>
      <key>daemon/Group</key>
      <signature>s</signature>
      <default>gdm</default>
    </schema>
    <schema>
      <key>daemon/AutomaticLoginEnable</key>
      <signature>b</signature>
      <default>false</default>
    </schema>
    <schema>
      <key>daemon/AutomaticLogin</key>
      <signature>s</signature>
      <default></default>
    </schema>
    <schema>
      <key>daemon/TimedLoginEnable</key>
      <signature>b</signature>
      <default>false</default>
    </schema>
    <schema>
      <key>daemon/TimedLogin</key>
      <signature>s</signature>
      <default></default>
    </schema>
    <schema>
      <key>daemon/TimedLoginDelay</key>
      <signature>i</signature>
      <default>30</default>
    </schema>
    <schema>
      <key>daemon/InitialSetupEnable</key>
      <signature>b</signature>
      <default>true</default>
    </schema>
    <schema>
      <key>daemon/WaylandEnable</key>
      <signature>b</signature>
      <default>true</default>
    </schema>
    <schema>
      <key>security/AllowRemoteAutoLogin</key>
      <signature>b</signature>
      <default>false</default>
    </schema>

    <schema>
      <key>debug/Enable</key>
      <signature>b</signature>
      <default>false</default>
    </schema>

    <schema>
      <key>security/DisallowTCP</key>
      <signature>b</signature>
      <default>true</default>
    </schema>
    <schema>
      <key>xdmcp/Enable</key>
      <signature>b</signature>
      <default>false</default>
    </schema>
    <schema>
      <key>xdmcp/ShowLocalGreeter</key>
      <signature>b</signature>
      <default>true</default>
    </schema>
    <schema>
      <key>xdmcp/MaxPending</key>
      <signature>i</signature>
      <default>4</default>
    </schema>
    <schema>
      <key>xdmcp/MaxSessions</key>
      <signature>i</signature>
      <default>16</default>
    </schema>
    <schema>
      <key>xdmcp/MaxWait</key>
      <signature>i</signature>
      <default>30</default>
    </schema>
    <schema>
      <key>xdmcp/DisplaysPerHost</key>
      <signature>i</signature>
      <default>1</default>
    </schema>
    <schema>
      <key>xdmcp/Port</key>
      <signature>i</signature>
      <default>177</default>
    </schema>
    <schema>
      <key>xdmcp/HonorIndirect</key>
      <signature>b</signature>
      <default>true</default>
    </schema>
    <schema>
      <key>xdmcp/MaxWaitIndirect</key>
      <signature>i</signature>
      <default>30</default>
    </schema>
    <schema>
      <key>xdmcp/PingIntervalSeconds</key>
      <signature>i</signature>
      <default>0</default>
    </schema>
    <schema>
      <key>xdmcp/Willing</key>
      <signature>s</signature>
      <default>/etc/gdm3/Xwilling</default>
    </schema>
  </schemalist>
</gdmschemafile>