[ZDP] BackTalk to Document The Zope Book (2.5 Edition)/Variables and Advanced DTML

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A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZopeBook/current/AdvDTML.stx#2-103

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    The *in* tag provides several variables to facilitate batch
    processing.  Let's look at a complete example that shows how to
    display 100 items in batches of 10 at a time::

      <dtml-var standard_html_header>

        <dtml-in expr="_.range(100)" size=10 start=query_start>

          <dtml-if sequence-start>

            <dtml-if previous-sequence>
              <a href="<dtml-var URL><dtml-var sequence-query
                 >query_start=<dtml-var previous-sequence-start-number>">
                 (Previous <dtml-var previous-sequence-size> results)
              </a>
            </dtml-if>

            <h1>These words are displayed at the top of a batch:</h1>
            <ul>

          </dtml-if>

            <li>Iteration number: <dtml-var sequence-item></li>

          <dtml-if sequence-end>

            </ul>
            <h4>These words are displayed at the bottom of a batch.</h4>

            <dtml-if next-sequence>
               <a href="<dtml-var URL><dtml-var sequence-query
                  >query_start=<dtml-var
                  next-sequence-start-number>">
               (Next <dtml-var next-sequence-size> results)
               </a>

            </dtml-if>

          </dtml-if>

        </dtml-in>

      <dtml-var standard_html_footer>

      % Saman - Nov. 17, 2002 8:17 am:
       this must be a DTNL document in order to function,If you shoose to implemented as Method it will not
       function?
       Why is That????