From: Andrew Morton <akpm@linux-foundation.org>
Date: Tue, 28 Aug 2007 21:13:35 -0700
He is using attributes, which is perfect and arbitrarily
extensible with zero backwards compatability concerns.
If he wants to provide a new attribute, he just adds it
without any issues.
When new attributes are added, older apps simply ignore the attributes
they don't understand.
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