code: function parseLinks (graph, subject, predicate, object, source) {
    var links = {}
    var matches = graph.statementsMatching(subject,
      predicate, object, source)
    matches.forEach(function (match) {
      links[match.object.uri] = true
    })
    return Object.keys(links)
  }
docs: Extracts the URIs from a parsed graph that match parameters.
  The URIs are a set (duplicates are removed)
  @method parseLinks
  
  @param graph {Graph}
  @param subject {NamedNode}
  @param predicate {NamedNode}
  @param object {NamedNode}
  @param source {NamedNode}
  
  @return {Array<string>} Array of link URIs that match the parameters