skos:hasTopConcept mandatory?

From: Oreste Signore <oreste.signore@isti.cnr.it>
Date: Tue, 03 Sep 2013 17:13:08 +0200
To: public-esw-thes@w3.org
Message-id: <5225FC84.3060900@isti.cnr.it>

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Received on Tuesday, 3 September 2013 15:13:32 UTC