This page represents a chat room. The page contains the following Link Rel tag:
<link rel="meta" type="application/rdf+xml" href="/RDF/testcases/labels_and_rules.rdf" title="Rating for this page" />
That is, it points to the labels_and_rules.rdf RDF instance and assumes that the client will be able to deduce which of the several labels available should be applied to this resource.