Is there a general "preferred" property?

Essentially what I'm looking for is something like

   foaf:nick x:preferred foaf:preferredNick .
   rdfs:label x:preferred foaf:preferredLabel .
   owl:sameAs x:preferred x:canonical .

It's nice to have con:preferredURI and skos:prefLabel, but what I'm 
really looking for is a way to let machines know that x value is preferred.

Anybody know if such a property exists yet?

Cheers,

Nathan