[ZDP] BackTalk to Document The Zope Book (2.6 Edition)/Advanced Zope Scripting

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A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/ScriptingZope.stx#4-31

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        from a Page
        Template::

          <span tal:content="dummy here/foo/updateInfo"/>

          % Anonymous User - Dec. 9, 2003 6:17 am:
           Why is used dummy in a content tal?