skos:hasTopConcept mandatory?

From: Oreste Signore <oreste@w3.org>
Date: Tue, 03 Sep 2013 18:51:49 +0200
To: public-esw-thes@w3.org
Message-id: <522613A5.8090904@w3.org>

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Received on Tuesday, 3 September 2013 16:52:12 UTC