Extension points

phil/address

The library is plain PHP: it declares no service and no port, and its classes are final. What an application chooses goes through arguments, and the data are imported rather than configured.

Point	How
The language of an address	The `$locale` of `AddressFormatter::format()`, `lines()`, `postalLabel()` and `Countries::name()`: the country's own language chooses its local format and subdivision names
The country mail is sent from	The `$origin` of `AddressFormatter::postalLabel()`: the country line is added from abroad only
Stricter rules than the country's	`AddressValidator::violations()` gives what the country's format says; rules of the application's own — a delivery zone, a field it always wants — are checked beside it
Where an address is kept	`AddressArray::from()` gives an array for one JSON column, `AddressArray::to()` reads it back
Structured data	`SchemaOrg::of()` gives a schema.org `PostalAddress` to embed in the application's JSON-LD
The formats and subdivisions	The PHP data in `data/`, imported from a release of commerceguys/addressing by `Data\DataImporter` through `bin/import-data.php`; a newer release is imported, never edited by hand — see Data
Catching the library's errors	Every exception implements `Phil\Address\Exception\AddressException`

Country names come from symfony/intl and follow its releases: an application that names a country otherwise keeps its own labels.