A post town is not the same as a locality. A post town can encompass a collection of (small) localities. It can also be a subpart of a locality. An actual post town in Norway is "Bergen".
Specification of a single premise, for example a house or a building. The premise as a whole has a unique premise (house) number or a premise name. There could be more than
one premise in a street referenced in an address. For example a building address near a major shopping centre or raiwlay station
Area Code, Postcode, Delivery code as in NZ, etc
DES, DE, LA, LA, DU in RUE DU BOIS. These terms connect a premise/thoroughfare type and premise/thoroughfare name. Terms may appear with names AVE DU BOIS
COMPLEXE in COMPLEX DES JARDINS, A building, station, etc
Name of the the Mail Stop. eg. MSP, MS, etc
A MailStop is where the the mail is delivered to within a premise/subpremise/firm or a facility.
PostalCode is the container element for either simple or complex (extended) postal codes. Type: Area Code, Postcode, etc.
Number of the Mail stop. eg. 123 in MS 123
Used by postal services to encode the name of the element.