NetworkManager/introspection/nm-settings-connection.xml

<?xml version="1.0" encoding="UTF-8" ?>

<node name="/">

  <interface name="org.freedesktop.NetworkManagerSettings.Connection">

    <method name="GetID">
      <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_connection_settings_get_id"/>
      <arg name="id" type="s" direction="out"/>
    </method>

    <method name="GetSettings">
      <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_connection_settings_get_settings"/>
      <arg name="settings" type="a{sa{sv}}" direction="out"/>
    </method>

    <method name="GetSecrets">
      <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="impl_connection_settings_get_secrets"/>
      <annotation name="org.freedesktop.DBus.GLib.Async" value=""/>
      <arg name="setting_name" type="s" direction="in"/>
      <arg name="request_new" type="b" direction="in"/>
      <arg name="secrets" type="a{sv}" direction="out"/>
    </method>

    <signal name="Updated">
      <arg name="settings" type="a{sa{sv}}"/>
    </signal>

    <signal name="Removed">
    </signal>

  </interface>

</node>