def by_bounding_box(self, tl_lat, tl_long, br_lat, br_long, term=None, num_biz_requested=None, category=None):
header, content = self._http_request(<EOL>self.BASE_URL, <EOL>tl_lat  = tl_lat, <EOL>tl_long = tl_long,<EOL>br_lat  = br_lat, <EOL>br_long = br_long,<EOL>term    = term,<EOL>category = category,<EOL>num_biz_requested = num_biz_requested<EOL>)  <EOL>return json.loads(content)<EOL>
Perform a Yelp Review Search based on a map bounding box.

Args:
  tl_lat   - bounding box top left latitude 
  tl_long  - bounding box top left longitude  
  br_lat   - bounding box bottom right latitude
  br_long  - bounding box bottom right longitude
  term     - Search term to filter by (Optional)
  num_biz_requested - Maximum number of matching results to return (Optional)
  category - '+'-seperated list of categories to filter by. See
http://www.yelp.com/developers/documentation/category_list
                          for list of valid categories. (Optional)