@prefix vcard:   <http://www.w3.org/2001/vcard-rdf/3.0#> .
@prefix foaf:    <http://xmlns.com/foaf/0.1/> .

<http://somewhere/RebeccaSmith/>
      foaf:knows    <http://somewhere/JohnSmith/> .

<http://somewhere/JohnSmith/>
      foaf:knows    <http://somewhere/RebeccaSmith/> .

<http://somewhere/SarahJones/>
      foaf:knows    <http://somewhere/MattJones/> .

<http://somewhere/MattJones/>
      foaf:knows    <http://somewhere/SarahJones/> .