public static function createFromModel(Statement $statement)
 {
     $mappedStatement = new MappedStatement();
     $mappedStatement->id = $statement->getId();
     $mappedStatement->actor = $statement->getActor();
     $mappedStatement->verb = MappedVerb::createFromModel($statement->getVerb());
     $mappedStatement->object = $statement->getObject();
     $mappedStatement->result = $statement->getResult();
     $mappedStatement->authority = $statement->getAuthority();
     $mappedStatement->created = $statement->getCreated();
     $mappedStatement->stored = $statement->getStored();
     return $mappedStatement;
 }