Tag <Link is not used

<vxml version="2.0">
.
.
<var name="sandeepAfter" expr="'-1 , '" />
<var name="validationfile" expr="''" />

<link dtmf="*" next="log02.aspx?previous=true" />
<link dtmf="66" next="log02.aspx?cancel=true" />
<link dtmf="666" next="log02.aspx?exit=true" />
<link dtmf="111" next="log02.aspx?skip=true" />
<property name="interdigittimeout" value="5s" />
<form id="frmQuestions">
<block>
<assign name="defaultvar" expr="'#myAppplication#'" />
<assign name="updateuseranswer" expr="'false'" />
<prompt bargein="true">
<audio expr="'http://192.168.11.1/Appplication/General.1.wav+-2a669ff1-8d6a-4e8a-8f4c-b6ad178dabdc.wav'" />
</prompt>
<submit next="log02.aspx" namelist="defaultvar systemvalue keypressed useranswer " method="post" />
</block>
</form>
</vxml>

Tag <Link is not used, nevertheless comprises of the document. This affirmation is true or false?