code: def create_review_node(self, review):
          
          review_node = BNode()
          type_triple = (review_node, RDF.type, self.spdx_namespace.Review)
          self.graph.add(type_triple)
  
          reviewer_node = Literal(review.reviewer.to_value())
          self.graph.add((review_node, self.spdx_namespace.reviewer, reviewer_node))
          reviewed_date_node = Literal(review.review_date_iso_format)
          reviewed_triple = (review_node, self.spdx_namespace.reviewDate, reviewed_date_node)
          self.graph.add(reviewed_triple)
          if review.has_comment:
              comment_node = Literal(review.comment)
              comment_triple = (review_node, RDFS.comment, comment_node)
              self.graph.add(comment_triple)
  
          return review_node
docs: Return a review node.