[Zope] [ZGotW] Issue #1 (Open)

[Zope Guru of the Week]

A new issue of "Zope Guru of the Week" is available:

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Issue #1 -- DTML Subroutines
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       Status:  Open 

    Zen Level:  Novice (1/8)

     Keywords:  DTML 

 Submitted by:  Tres Seaver tseaver@palladion.com
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 Suppose you have been happily hacking away at your Zope site,
 and discover that you are reusing a chunk of DTML over 
 and over::

  <!-- Display all contained FooTypes in a table-->
  <dtml-in "objectValues( 'FooType' )">
  <tr>
    <td> <a href="&dtml-id;"><dtml-var id></a> </td>
    <!-- more FooType properties follow -->
  </tr>
  </dtml-in>

 Now, you decide to "refactor" the site to follow the
 "Once and Only Once":http://c2.com/cgi/wiki?OnceAndOnlyOnce dictum of 
 "Extreme Programming":http://www.extremeprogramming.org :
 i.e., you'd like to make this snippet a reusable "subroutine,"
 so that you could make changes to it in just one place.

 How do you move this code out into a DTML Method and then
 replace all the cloned copies with calls to that method?
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