why two dashes in extension load files

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: pgsql-hackers(at)postgresql(dot)org
Subject: why two dashes in extension load files
Date: 2011-02-14 13:45:35
Message-ID: 1297691135.9529.1.camel@fsopti579.F-Secure.com
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Why do the extension load files need two dashes, like xml2--1.0.sql?
Why isn't one enough?

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