A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/AppendixC.stx#3-39
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If the expression associated with an attribute assignment evaluates
to *nothing*, then that attribute is deleted from the statement
element. If the expression evaluates to *default*, then that
attribute is left unchanged. Each attribute assignment is
independent, so attributes may be assigned in the same statement in
which some attributes are deleted and others are left alone.
% Anonymous User - Dec. 19, 2003 12:58 pm:
This seems to contradict the Order of Operations, above, where it says that attribution takes place after
replacement. That way seems better than ignoring the attribution altogether.
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