IAddress

The model carries an address two ways at once: as separate parts (Region, City, Street, House, Building, Entrance, Floor, Flat, Doorphone, Index, AdditionalInfo) and as two summary lines — Line1 ("where to deliver") and Line2 (how to find the guest once there).

Print `Line1`. That is what the stock delivery invoice and courier route list use, with the district and the note on separate lines. Assemble the address from its parts only when you need your own order or your own separators.

Which parts are filled depends on the delivery address format chosen at the office, and this is the model's main trap:

• in the old format the operator picks the street from a directory and types the house number, and the city comes from the street — the parts are meaningful;
• in the smart (new) format the street and house are typed as one line, and the street reference is replaced by a service "default street". Street and House then carry service values rather than being empty: string.IsNullOrEmpty(Street) will not filter them out, and the receipt gets noise.

The address is not necessarily typed by a cashier: it can arrive from the call centre, from the web office or from an order aggregator through the API — with a different set of filled fields each time.

UaeAddressingSystem marks the UAE addressing system, where the familiar "street and house" pair carries no meaning.