Finally, the age is to be specified. This parameter puts a time threshold to the search and any tag older than the specified age is discarded. At the end of the search, a list of found tags are collected in a list in the order they are found and the first element of this list is returned as the result of the search. In case the user is not satisfied with the best bet, the user asks for the next element on the list. The search can be initiated at a specified point.
Depth indicates the distance in terms of neighborhood as illustrated.