This file is indexed.

/usr/share/dbus-1/interfaces/org.freedesktop.ModemManager1.Modem.Signal.xml is in modemmanager-dev 1.6.8-2ubuntu1.

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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" ?>

<!--
 ModemManager 0.8 Interface Specification

   Copyright (C) 2013 Aleksander Morgado <aleksander@gnu.org>
-->

<node name="/" xmlns:doc="http://www.freedesktop.org/dbus/1.0/doc.dtd">

  <!--
      org.freedesktop.ModemManager1.Modem.Signal:
      @short_description: The ModemManager Signal interface.

      This interface provides access to extended signal quality information.
  -->
  <interface name="org.freedesktop.ModemManager1.Modem.Signal">

    <!--
        Setup:
        @rate: refresh rate to set, in seconds. 0 to disable retrieval.

        Setup extended signal quality information retrieval.
    -->
    <method name="Setup">
      <arg name="rate" type="u" direction="in" />
    </method>

    <!--
        Rate:

        Refresh rate for the extended signal quality information updates,
        in seconds. A value of 0 disables the retrieval of the values.
    -->
    <property name="Rate" type="u" access="read" />

    <!--
        Cdma:

        Dictionary of available signal information for the CDMA1x access
        technology.

        This dictionary is composed of a string key, with an associated data
        which contains type-specific information.

        <variablelist>
        <varlistentry><term><literal>"rssi"</literal></term>
          <listitem>
            <para>
              The CDMA1x RSSI (Received Signal Strength Indication), in dBm,
              given as a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"ecio"</literal></term>
          <listitem>
            <para>
              The CDMA1x Ec/Io, in dBm, given as a floating point value
              (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        </variablelist>
    -->
    <property name="Cdma" type="a{sv}" access="read" />

    <!--
        Evdo:

        Dictionary of available signal information for the CDMA EV-DO access
        technology.

        This dictionary is composed of a string key, with an associated data
        which contains type-specific information.

        <variablelist>
        <varlistentry><term><literal>"rssi"</literal></term>
          <listitem>
            <para>
              The CDMA EV-DO RSSI (Received Signal Strength Indication), in dBm,
              given as a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"ecio"</literal></term>
          <listitem>
            <para>
              The CDMA EV-DO Ec/Io, in dBm, given as a floating point value
              (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"sinr"</literal></term>
          <listitem>
            <para>
              CDMA EV-DO SINR level, in dB, given as a floating point value
              (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"io"</literal></term>
          <listitem>
            <para>
              The CDMA EV-DO Io, in dBm, given as a floating point value
              (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        </variablelist>
    -->
    <property name="Evdo" type="a{sv}" access="read" />

    <!--
        Gsm:

        Dictionary of available signal information for the GSM/GPRS access
        technology.

        This dictionary is composed of a string key, with an associated data
        which contains type-specific information.

        <variablelist>
        <varlistentry><term><literal>"rssi"</literal></term>
          <listitem>
            <para>
              The GSM RSSI (Received Signal Strength Indication), in dBm,
              given as a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        </variablelist>
    -->
    <property name="Gsm" type="a{sv}" access="read" />

    <!--
        Umts:

        Dictionary of available signal information for the UMTS (WCDMA) access
        technology.

        This dictionary is composed of a string key, with an associated data
        which contains type-specific information.

        <variablelist>
        <varlistentry><term><literal>"rssi"</literal></term>
          <listitem>
            <para>
              The UMTS RSSI (Received Signal Strength Indication), in dBm,
              given as a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
          </varlistentry>
        <varlistentry><term><literal>"rscp"</literal></term>
          <listitem>
            <para>
              The UMTS RSCP (Received Signal Code Power), in dBm, given as a
              floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"ecio"</literal></term>
          <listitem>
            <para>
              The UMTS Ec/Io, in dBm, given as a floating point value
              (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        </variablelist>
    -->
    <property name="Umts" type="a{sv}" access="read" />

    <!--
        Lte:

        Dictionary of available signal information for the LTE access
        technology.

        This dictionary is composed of a string key, with an associated data
        which contains type-specific information.

        <variablelist>
        <varlistentry><term><literal>"rssi"</literal></term>
          <listitem>
            <para>
              The LTE RSSI (Received Signal Strength Indication), in dBm,
              given as a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"rsrq"</literal></term>
          <listitem>
            <para>
              The LTE RSRQ (Reference Signal Received Quality), in dB, given as
              a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"rsrp"</literal></term>
          <listitem>
            <para>
              The LTE RSRP (Reference Signal Received Power), in dBm, given as
              a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"snr"</literal></term>
          <listitem>
            <para>
              The LTE S/R ratio, in dB, given as
              a floating point value (signature <literal>"d"</literal>).
            </para>
          </listitem>
        </varlistentry>
        </variablelist>
    -->
    <property name="Lte" type="a{sv}" access="read" />

  </interface>
</node>