code: def unlink(self, definition, doc1, doc2) :
          "deletes all links between doc1 and doc2"
          links = self.database[definition].fetchByExample( {"_from": doc1._id,"_to" : doc2._id}, batchSize = 100)
          for l in links :
              self.deleteEdge(lf unlink(self, definition, doc1, doc2) :
          "deletes all links between doc1 and doc2"
          links = self.database[definition].fetchByExample( {"_from": doc1._id,"_to" : doc2._id}, batchSize = 100)
          for l in links :
              self.deleteEdge(l)
docs: deletes all links between doc1 and doc2