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@@ -4629,7 +4629,9 @@ useful, you can turn it on by setting the variable
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@code{org-use-property-inheritance}. It may be set to @code{t} to make
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all properties inherited from the parent, to a list of properties
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that should be inherited, or to a regular expression that matches
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-inherited properties.
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+inherited properties. If a property has the value @samp{nil}, this is
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+interpreted as an explicit undefine of he property, so that inheritance
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+search will stop at this value and return @code{nil}.
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Org mode has a few properties for which inheritance is hard-coded, at
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least for the special applications for which they are used:
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Carsten Dominik