path: root/lib/snmp/doc/src/notes.xml

<?xml version="1.0" encoding="iso-8859-1" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">

<chapter>
  <header>
    <copyright>
      <year>1996</year><year>2012</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.
    
      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.
    
    </legalnotice>

    <title>SNMP Release Notes</title>
    <prepared></prepared>
    <responsible></responsible>
    <docno></docno>
    <approved></approved>
    <checked></checked>
    <date></date>
    <rev></rev>
    <file>notes.xml</file>
  </header>


  <section>
    <title>SNMP Development Toolkit 4.22</title>
    <p>Version 4.22 supports code replacement in runtime from/to
    version 4.21.7, 4.21.6, 4.21.5, 4.21.4, 4.21.3, 4.21.2, 4.21.1 and 
    4.21. </p>

    <section>
      <title>Improvements and new features</title>
      <!--
      <p>-</p>
      -->

      <list type="bulleted">
        <item>
          <p>[agent] Documenting previously existing but undocumented function, 
	  <seealso marker="snmp_generic#get_table_info">snmp_generic:get_table_info/2</seealso>. </p>
	  <p>Own Id: OTP-9942</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <p>-</p>

      <!--
      <list type="bulleted">
        <item>
          <p>[agent] Simultaneous 
	  <seealso marker="snmpa#backup">snmpa:backup/1,2</seealso> 
	  calls can interfere.
	  The master agent did not check if a backup was already in 
	  progress when a backup request was accepted. </p>
          <p>Own Id: OTP-9884</p>
          <p>Aux Id: Seq 11995</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.22 -->


  <section>
    <title>SNMP Development Toolkit 4.21.7</title>
    <p>Version 4.21.7 supports code replacement in runtime from/to
    version 4.21.6, 4.21.5, 4.21.4, 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1 and 
    4.20. </p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p>

      <!--
      <list type="bulleted">
        <item>
          <p>[agent] DoS attack using GET-BULK with large value of 
	  MaxRepetitions.
	  A preventive method has been implementing by simply 
	  limit the number of varbinds that can be included in 
	  a Get-BULK response message. This is specified by the 
	  new config option, 
	  <seealso marker="snmp_app#agent_gb_max_vbs">gb_max_vbs</seealso>. 
	  </p>
	  <p>Own Id: OTP-9700</p>
        </item>

      </list>
      -->

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!--
      <p>-</p>
      -->

      <list type="bulleted">
        <item>
          <p>[agent] Simultaneous 
	  <seealso marker="snmpa#backup">snmpa:backup/1,2</seealso> 
	  calls can interfere.
	  The master agent did not check if a backup was already in 
	  progress when a backup request was accepted. </p>
          <p>Own Id: OTP-9884</p>
          <p>Aux Id: Seq 11995</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.21.7 -->


  <section>
    <title>SNMP Development Toolkit 4.21.6</title>
    <p>Version 4.21.6 supports code replacement in runtime from/to
    version 4.21.5, 4.21.4, 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1 and 
    4.20. </p>

    <section>
      <title>Improvements and new features</title>
      <!--
      <p>-</p>
      -->

      <list type="bulleted">
        <item>
          <p>[agent] DoS attack using GET-BULK with large value of 
	  MaxRepetitions.
	  A preventive method has been implementing by simply 
	  limit the number of varbinds that can be included in 
	  a Get-BULK response message. This is specified by the 
	  new config option, 
	  <seealso marker="snmp_app#agent_gb_max_vbs">gb_max_vbs</seealso>. 
	  </p>
	  <p>Own Id: OTP-9700</p>
        </item>

      </list>

    </section>

    <section>
      <title>Reported Fixed Bugs and Malfunctions</title>
      <!--
      <p>-</p>
      -->

      <list type="bulleted">
        <item>
          <p>[agent] Mib server cache gclimit update function incorrectly calls 
	  age update function. 
	  The gclimit update function, 
	  <seealso marker="snmpa#update_mibs_cache_gclimit">update_mibs_cache_gclimit/1</seealso>, 
	  <em>incorrectly</em> called the age update function, 
	  <seealso marker="snmpa#update_mibs_cache_age">update_mibs_cache_age/2</seealso>. </p>
	  <p>Johan Claesson</p>
          <p>Own Id: OTP-9868</p>
        </item>

      </list>

    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.21.6 -->


  <section>
    <title>SNMP Development Toolkit 4.21.5</title>
    <p>Version 4.21.5 supports code replacement in runtime from/to
      version 4.21.4, 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1 and 4.20. </p>

    <section>
      <title>Improvements and new features</title>
<!--
      <p>-</p>
-->

      <list type="bulleted">
        <item>
          <p>[agent] Removed (more) use of old style tuple funs. </p>
          <p>Own Id: OTP-9783</p>
        </item>

      </list>

    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->

      <list type="bulleted">
        <item>
          <p>[agent] Repeated vacm table dumping fails due to file name 
          conflict. When dumping the vacm table to disk, a temoporary 
          file with a fixed name was used. If the table dumping 
          (snmpa_vacm:dump_table/0) was initiated from several different 
          processes in rapid succesion, the dumping could fail because the 
          different processes was simultaniously trying to write to the 
          same file. This problem has been eliminated by creating a unique 
          name for the temporary file. </p>
          <p>Own Id: OTP-9851</p>
          <p>Aux Id: Seq 11980</p>
        </item>

      </list>
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>

<!--
      <list type="bulleted">
        <item>
          <p>foo. </p>
          <p>Own Id: OTP-9718</p>
        </item>

      </list>
-->

    </section>

  </section> <!-- 4.21.5 -->


  <section>
    <title>SNMP Development Toolkit 4.21.4</title>
    <p>This version has never been released for R14B.</p>
    <p>Version 4.21.4 supports code replacement in runtime from/to
      version 4.21.3, 4.21.2, 4.21.1, 4.21, 4.20.1, 4.20 and 4.19. </p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p>

<!--
      <list type="bulleted">
        <item>
          <p>[compiler] Improved version info printout from the 
          <seealso marker="snmpc(command)#">MIB compiler frontend escript</seealso>. </p>
          <p>Own Id: OTP-9618</p>
        </item>

      </list>
-->

    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->

      <list type="bulleted">
        <item>
          <p>[agent] Removed use of old style tuple funs. </p>
          <p>Own Id: OTP-9779</p>
        </item>

      </list>
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>

<!--
      <list type="bulleted">
        <item>
          <p>foo. </p>
          <p>Own Id: OTP-9718</p>
        </item>

      </list>
-->

    </section>

  </section> <!-- 4.21.4 -->


  <section>
    <title>SNMP Development Toolkit 4.21.3</title>
    <p>Version 4.21.3 supports code replacement in runtime from/to
      version 4.21.2, 4.21.1, 4.21, 4.20.1, 4.20 and 4.19. </p>

    <section>
      <title>Improvements and new features</title>
<!--
      <p>-</p>
-->

      <list type="bulleted">
        <item>
          <p>[compiler] Improved version info printout from the 
	  <seealso marker="snmpc(command)#">MIB compiler frontend escript</seealso>. </p>
          <p>Own Id: OTP-9618</p>
        </item>

      </list>

    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->

      <list type="bulleted">
        <item>
          <p>[agent] Version 4.20 introduced a change that broke trap 
	  sending from subagents. Due to a bug in the test code, 
	  this was not discovered, until that bug was fixed. </p>
          <p>Own Id: OTP-9745</p>
        </item>

        <item>
          <p>[agent] When sending an error message (reply) regarding 
	  <c>snmpUnknownPDUHandlers</c>, the agent used the wrong OID. </p>
          <p>Own Id: OTP-9747</p>
        </item>

        <item>
          <p>[compiler] Fix the <c>--warnings/--W</c> option parsing in the 
          <seealso marker="snmpc(command)#option_warnings">snmpc</seealso>
          wrapper (e)script. 
          The short warning option was incorrectly <c>--w</c>, instead
          of as documented <c>--W</c>. This has now been corrected. </p>
          <p>*** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Tuncer Ayaz</p>
          <p>Own Id: OTP-9718</p>
        </item>

      </list>
    </section>


    <section>
      <title>Incompatibilities</title>
<!--
      <p>-</p>
-->

      <list type="bulleted">
        <item>
          <p>[compiler] The short warning option has been changed from 
          <c>--w</c> to <c>--W</c> to comply with the documentation. </p>
          <p>Tuncer Ayaz</p>
          <p>Own Id: OTP-9718</p>
        </item>

      </list>
    </section>

  </section> <!-- 4.21.3 -->


  <section>
    <title>SNMP Development Toolkit 4.21.2</title>
    <p>Version 4.21.2 supports code replacement in runtime from/to
      version 4.21.1, 4.21, 4.20.1, 4.20 and 4.19. </p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p>

<!--
      <list type="bulleted">
        <item>
          <p>Bad note store GC timer deactivation. 
	  Wrong field in the state record was set (timeout instead active). </p>
          <p>Stefan Grundmann</p>
          <p>Own Id: OTP-9690</p>
        </item>

      </list>
-->

    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->

      <list type="bulleted">
        <item>
          <p>Bad note store GC timer deactivation. 
	  Wrong field in the state record was set (timeout instead active). </p>
          <p>Stefan Grundmann</p>
          <p>Own Id: OTP-9690</p>
        </item>

      </list>
    </section>


    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.21.2 -->


  <section>
    <title>SNMP Development Toolkit 4.21.1</title>
    <p>Version 4.21.1 supports code replacement in runtime from/to
      version 4.20.1, 4.20 and 4.19. </p>

    <section>
      <title>Improvements and new features</title>
<!--
      <p>-</p>
-->
      <list type="bulleted">
        <item>
          <p>[compiler] Used wrong variable name (for 
	  warnings-as-errors variable), which caused the 
	  compiler to crash when using the snmpc (e)script. </p>
	  <p>Also added the option 
	  <seealso marker="snmpc(command)#option_werror">--Werror</seealso>
	  for the SNMP MIB compiler (escript) frontend (to mimic 
	  <seealso marker="erts:erlc">erlc</seealso>), 
	  which specifies whether warnings should be treated as errors. </p>
          <p>Own Id: OTP-9447</p>
        </item>

        <item>
          <p>[agent] Some very minor debugging improvements. </p>
          <p>Own Id: OTP-9446</p>
        </item>
      </list>

    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <p>-</p> 

<!--
      <list type="bulleted">
        <item>
          <p>The snmp config tool could not handle (manager) audit trail config 
	  because the option seqno was not handled. </p>
	  <p>Own Id: OTP-9354</p>
	</item>

      </list>
-->
    </section>


    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.21.1 -->


  <section>
    <title>SNMP Development Toolkit 4.21</title>
    <p>Version 4.21 supports code replacement in runtime from/to
      version 4.20.1, 4.20 and 4.19. </p>

    <section>
      <title>Improvements and new features</title>
<!--
      <p>-</p>
-->
      <list type="bulleted">
        <item>
          <p>[manager] There was no way to specify transport domain. 
	  The transport domains was assumed to be IPv4 (transportDomainUdpIpv4).
	  This has now been changed so that it can also be IPv6 
	  (transportDomainUdpIpv6). 
	  To facilitate this, the transport domain, <c>tdomain</c>, 
	  is now a (new) valid option when 
	  <seealso marker="snmpm#register_agent">registering</seealso>
	  a new agent (and 
	  <seealso marker="snmpm#update_agent_info">updating</seealso> 
	  agent info). </p>
	  <p>This also mean that the transport behaviour has changed. </p>
          <p>Own Id: OTP-9305</p>
          <p>Aux Id: Seq 11847</p>
        </item>

        <item>
          <p>[compiler] Added the option 
	  <seealso marker="snmpc#compile">warnings_as_errors</seealso> 
	  (for the SNMP MIB compiler (escript) frontend, the option 
	  <seealso marker="snmpc(command)#option_wae">--wae</seealso> is used) 
	  which specifies whether warnings should be treated as errors. </p>
          <p>Tuncer Ayaz</p>
          <p>Own Id: OTP-9437</p>
        </item>
      </list>

    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->

      <list type="bulleted">
        <item>
          <p>The snmp config tool could not handle (manager) audit trail config 
	  because the option seqno was not handled. </p>
	  <p>Own Id: OTP-9354</p>
	</item>

        <item>
          <p>[agent] The SNMP ACM cache was not properly updated when
	  changes where made to the VACM security-to-group, access and
	  view-tree-family tables. </p>
	  <p>Own Id: OTP-9367</p>
          <p>Aux Id: Seq 11858</p>
	</item>

        <item>
          <p>Fixed install directory typo for man3. </p>
	  <p>Peter Lemenkov</p>
	  <p>Hans Ulrich Niedermann</p>
	  <p>Own Id: OTP-9442</p>
	</item>

      </list>
    </section>


    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.21 -->


  <section>
    <title>SNMP Development Toolkit 4.20.1</title>
    <p>Version 4.20.1 supports code replacement in runtime from/to
      version 4.20, 4.19 and 4.18.</p>

    <section>
      <title>Improvements and new features</title>
      <p>-</p>
<!--
      <list type="bulleted">
        <item>
          <p>Added type specs for functions that do not return. </p>
          <p>Kostis Sagonas</p>
          <p>Own Id: OTP-9208</p>
        </item>
      </list>
-->
    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->
      <list type="bulleted">
        <item>
          <p>[agent] Did not handle transport domains properly in some cases, 
	  for instance trap sending. </p>
	  <p>Own Id: OTP-9400</p>
	</item>

        <item>
          <p>[agent] Wrong default transport domain, snmpUDPDomain, instead
	  of transportDomainUdpIpv4. </p>
	  <p>Own Id: OTP-9425</p>
          <p>Aux Id: Seq 11874</p>
	</item>

      </list>
    </section>


    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.20.1 -->


  <section>
    <title>SNMP Development Toolkit 4.20</title>
    <p>Version 4.20 supports code replacement in runtime from/to
      version 4.19 and 4.18.</p>

    <section>
      <title>Improvements and new features</title>
<!--
      <p>-</p>
-->
      <list type="bulleted">
        <item>
          <p>[agent] Added support for sending traps to IPv6 targets. </p>
	  <p>See the 
	  <seealso marker="snmp_agent_config_files#target_addr">target address config file</seealso>, 
	  the <seealso marker="snmpa_conf#target_addr_entry">target_addr_entry/11</seealso> function or 
	  <seealso marker="snmp_target_mib#add_addr">add_addr/11</seealso> for more info. </p>
          <p>Own Id: OTP-9088</p>
          <p>Aux Id: Seq 11790</p>
	</item>


        <item>
          <p>[agent] To be able to handle multiple engine-id(s) when
	  sending trap(s), the function 
          <seealso marker="snmp_community_mib#add_community">
	  add_community/6</seealso> has been added. </p>
          <p>Own Id: OTP-9119</p>
          <p>Aux Id: Seq 11792</p>
        </item>

        <item>
          <p>[manager] The API for snmp requests has been augmented to
	  allow the caller to override some configuration. </p>
	  <p>This has been done by introducing a new set of API functions, see 
	  <seealso marker="snmpm#sync_get2">sync_get2/3,4</seealso>, 
	  <seealso marker="snmpm#async_get2">async_get2/3,4</seealso>, 
	  <seealso marker="snmpm#sync_get_next2">sync_get_next2/3,4</seealso>, 
	  <seealso marker="snmpm#async_get_next2">async_get_next2/3,4</seealso>, 
	  <seealso marker="snmpm#sync_get_bulk2">sync_get_bulk2/5,6</seealso>, 
	  <seealso marker="snmpm#async_get_bulk2">async_get_bulk2/5,6</seealso>, 
	  <seealso marker="snmpm#sync_set2">sync_set2/3,4</seealso> and 
	  <seealso marker="snmpm#async_set2">async_set2/3,4</seealso>
	  for more info. </p>
          <p>Own Id: OTP-9162</p>
        </item>

        <item>
          <p>[manager] The old API functions (for get and set
	  requests: 
	  snmpm:g/3,4,5,6,7, snmpm:ag/3,4,5,6,7, 
	  snmpm:gn/3,4,5,6,7, snmpm:agn/3,4,5,6,7,
	  snmpm:s/3,4,5,6,7, snmpm:s/3,4,5,6,7,
	  snmpm:gb/5,6,7,8,9 and snmpm:agb/5,6,7,8,9)
	  are now officially deprecated.
	  They will be removed as of R16B. </p>
          <p>Own Id: OTP-9174</p>
        </item>

        <item>
          <p>[agent] Pass extra info through the agent to the net-if
	  process when sending notifications. </p>
	  <p>See 
	  <seealso marker="snmpa#send_notification2">
	  snmpa:send_notification2/3</seealso> for more info. 
	  See also the incomming net-if messages when sending a 
	  <seealso marker="snmp_agent_netif#im_send_pdu">trap</seealso> 
	  (send_pdu message) and 
	  <seealso marker="snmp_agent_netif#im_send_pdu_req">
	  notification</seealso> (send_pdu_req message). </p>
          <p>Own Id: OTP-9183</p>
          <p>Aux Id: Seq 11817</p>
        </item>

        <item>
          <p>Added type specs for functions that do not return. </p>
          <p>Kostis Sagonas</p>
          <p>Own Id: OTP-9208</p>
        </item>
      </list>
    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->

      <list type="bulleted">
        <item>
          <p>Fixed endode/decode of values of type <c>Counter32</c>. </p>
	  <p>This type (<c>Counter32</c>) is an unsigned integer 32, 
	  but is actually encoded as an signed integer 32. 
	  The encode/decode functions however, treated it as if it was 
	  encodeded as an unsigned integer 32. </p>
	  <p>Own Id: OTP-9022</p>
	</item>

      </list>
    </section>


    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.20 -->


  <section>
    <title>SNMP Development Toolkit 4.19</title>
    <p>Version 4.19 supports code replacement in runtime from/to
      version 4.18.</p>

    <section>
      <title>Improvements and new features</title>
<!--
      <p>-</p>
-->
      <list type="bulleted">
        <item>
          <p>[compiler] Added support for textual convention 
	  <c>AGENT-CAPABILITIES</c> and "full" support for textual 
          convention MODULE-COMPLIANCE, both defined by the SNMPv2-CONF 
          mib.</p>
          <p>The <c>reference</c> and <c>modules</c> part(s) are
	  stored in the <c>assocList</c> of the mib-entry (<c>me</c>) 
	  record. 
	  Only handled <em>if</em> the option(s) <c>agent_capabilities</c>
	  and <c>module_compliance</c> (respectively) are provided to the 
	  compiler. </p>
	  <p>See <seealso marker="snmpc#compile">compile/2</seealso> 
	  for more info. </p>
	  <p>For backward compatibillity, the MIBs provided with 
	  this application are <em>not</em> compiled with these 
	  options. </p>
          <p>Own Id: OTP-8966</p>
        </item>

        <item>
          <p>[agent] Added a "complete" set of (snmp) table and variable
          print functions, for each mib handled by the SNMP (agent)
          application. This will be usefull when debugging a running agent.</p>
          <p>See
          <seealso marker="snmpa#print_mib_info">print_mib_info/0</seealso>,
          <seealso marker="snmpa#print_mib_tables">print_mib_tables/0</seealso>
          and
          <seealso marker="snmpa#print_mib_variables">print_mib_variables/0</seealso>
          for more info. </p>
          <p>Own Id: OTP-8977</p>
        </item>

        <item>
          <p>[compiler] Added a MIB compiler (frontend) escript, 
          <c>snmpc</c>. </p>
          <p>Own Id: OTP-9004</p>
        </item>

      </list>
    </section>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
<!--
      <p>-</p> 
-->
      <list type="bulleted">
        <item>
          <p>[agent] For the table vacmAccessTable,
          when performing the is_set_ok and set operation(s),
          all values of the vacmAccessSecurityModel column was
          incorrectly translated to <c>any</c>. </p>
<!--
that is when calling:
snmp_view_basec_acm_mib:vacmAccessTable(set, RowIndex, Cols).
-->
          <p>Own Id: OTP-8980</p>
        </item>

        <item>
          <p>[agent] When calling
          <seealso marker="snmp_view_based_acm_mib#reconfigure">snmp_view_based_acm_mib:reconfigure/1</seealso>
          on a running node, the table <c>vacmAccessTable</c> was not properly
          cleaned.
          This meant that if some entries in the vacm.conf file was removed
          (compared to the <c>current</c> config),
          while others where modified and/or added, the removed entrie(s)
          would still exist in the <c>vacmAccessTable</c> table. </p>
          <p>Own Id: OTP-8981</p>
          <p>Aux Id: Seq 11750</p>
        </item>

      </list>
    </section>


    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>

  </section> <!-- 4.19 -->


  <section>
    <title>SNMP Development Toolkit 4.18</title>
    <p>Version 4.18 supports code replacement in runtime from/to
      version 4.17.1 and 4.17.</p>

    <section>
      <title>Improvements and new features</title>
      <list type="bulleted">
        <item>
          <p>Prepared for R14B release.</p>
        </item>
      </list>
    </section>

    <section><title>Fixed Bugs and Malfunctions</title>
      <p>-</p>
<!--
      <list type="bulleted">
        <item>
          <p>[agent] When the function FilterMod:accept_recv/2 returned false
          the SNMP agent stopped collecting messages from UDP.</p>
          <p>Own Id: OTP-8761</p>
        </item>
      </list>
-->
    </section>

    <section>
      <title>Incompatibilities</title>
      <p>-</p>
    </section>
  </section> <!-- 4.18 -->


  <!-- section>
    <title>Release notes history</title>
    <p>For information about older versions see
      <url href="part_notes_history_frame.html">release notes history</url>.</p>
  </section -->
</chapter>