Confused by example in 13.2.2

From: Dmitry Igrishin <dmitigr(at)gmail(dot)com>
To: pgsql-docs <pgsql-docs(at)postgresql(dot)org>
Subject: Confused by example in 13.2.2
Date: 2015-08-02 19:02:29
Message-ID: CAAfz9KPij74qK9YrzRXrhWhvdeZ8nZMqzMSMC+bkWSU7aBapLA@mail.gmail.com
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Hello,

I'm confused a bit by example in 13.2.2:
"For example, even a read only transaction at this level may see a
control record updated to show that a batch has been completed but
not see one of the detail records which is logically part of the batch
because it read an earlier revision of the control record."
Could anyone clarify this example? And what is "control record"?
Thanks.

--
// Dmitry.

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