There is however an RDF vocabulary for describing HTTP messages. You could use this to model a SKOS note as an HTTP response, e.g. ...
<A> rdf:type skos:Concept; skos:prefLabel "The theory of general relativity"@en; skos:note [ http:body "As embodied by the well known equation E=MC^2."; http:content-type "text/plain"; http:content-language "en"; ]; skos:note [ http:body """ As embodied by the well known equation <em>E</em> = <em>MC</em><sup>2</sup>. """^^rdfs:XMLLiteral; http:content-type "application/xhtml+xml"; http:content-language "en"; ]; .