<xml xmlns="https://developers.google.com/blockly/xml">
  <block type="comment" x="20" y="30">
    <field name="NAME"></field>
    <value name="TEXT">
          <shadow type="text">
            <field name="TEXT">this is a comment</field>
          </shadow>      
    </value>
    <next>
      <block type="comment">
        <field name="NAME"></field>
        <value name="TEXT">
          <shadow type="text">
            <field name="TEXT">this is another comment</field>
          </shadow>
        </value>
      </block>
    </next>
  </block>
</xml>