[ZDP] BackTalk to Document The Zope Book (2.5 Edition)/Dynamic Content with DTML

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A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZopeBook/current/DTML.stx#3-25

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      Some attributes don't have values. For example, you can convert
      an inserted variable to upper case with the *upper* attribute::

        <dtml-var exclamation upper>

        % Anonymous User - June 6, 2002 9:15 am:
         is "exclamation" a variable like "wingspan" or an attribute like "missing" in the examples above?

        % mcdonc - June 6, 2002 9:18 am:
         the former (a variable)

        % Anonymous User - June 25, 2002 4:52 am:
         exclamation is a variable, upper is an attribute which doesn't have a value

        % Anonymous User - Sep. 21, 2002 7:02 pm:
         to be exact: its (the name of) a variable; the canonical dtml-tag here is
         <dtml-var name="exclamation" upper>
         Zope has plenty of defaults to ease life, but some of these are tripwires for newbies.