Updated description of publicAccess to clarify usage

(#1569)

Author: RichardWallis

data/schema.rdfa

@@ -5050,7 +5050,7 @@ The place is __open__ if the [[opens]] property is specified, and __closed__ oth
     </div>
     <div typeof="rdf:Property" resource="http://schema.org/publicAccess">
       <span class="h" property="rdfs:label">publicAccess</span>
-      <span property="rdfs:comment">A flag to signal that the [[Place]] is accessible by public visitors.</span>
+      <span property="rdfs:comment">A flag to signal that the [[Place]] is open to public visitors.  If this property is omitted there is no assumed default boolean value</span>
       <span>Domain: <a property="http://schema.org/domainIncludes" href="http://schema.org/Place">Place</a></span>
       <span>Range: <a property="http://schema.org/rangeIncludes" href="http://schema.org/Boolean">Boolean</a></span>
     </div>