/usr/share/glib-2.0/schemas/org.gnome.Xchat.notification.gschema.xml is in xchat-gnome-common 1:0.30.0~git20141005.816798-0ubuntu9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | <schemalist>
<schema id="org.gnome.Xchat.plugins.notification" path="/org/gnome/Xchat/plugins/notification/">
<key name="level" type="i">
<default>3</default>
<summary>Level of the messages that require a notification</summary>
</key>
</schema>
</schemalist>
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