what does opaque mean in create function?

From: Pam Wampler <Pam_Wampler(at)taylorwhite(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: what does opaque mean in create function?
Date: 2002-02-18 18:34:30
Message-ID: 2E4528861499D41199D200A0C9B15BC0012F45A0@taylorwhite.com
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In a function what does opaque mean?

What does create function xx_insert() returns opaque as '
BEGIN
NEW.txs := 0;
END;
'
LANGUAGE 'plpgsql';

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