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    The <loop> tag and the corresponding HTML::Macro::Loop object provide
for repeated blocks of HTML, with subsequent iterations evaluated in
different contexts.  Typically you will want to select rows from a database
(lines from a file, files from a directory, etc), and present each
iteration in succession using identical markup.  You do this by creating a
<loop> tag in your template file containing the markup to be repeated, and
by creating a correspondingly named Loop object attached to the HTML::Macro
and containing all the data to be interpolated.  Note: this requires all
data to be fetched and stored before it is applied to the template; there
is no facility for streaming data.  For the intended use this is not a
problem.  However it militates against using HTML::Macro for text
processing of very large datasets.

  <loop id="people">
    <tr><td>#first_name# #last_name#</td><td>#email#</td></tr>
  </loop>

    The loop tag allows the single attribute "id" which can be any
    identifier.  Loop tags may be nested.  If during processing no matching
    loop object is found, a warning is produced and the tag is simply