Standards data

Which standard use for values like languages, countries, currencies, …

Agenzia per l'Italia Digital & Team per la trasformazione digital (Italian administration) - Interoperability model for the Public Administration

Use the properties according to standard nomenclatures

Haufe - Haufe API style guide

Currency

3-character ISO-4217

Country

ISO 3166-1-alpha-2

Zalando - RESTFul API Guidelines

Standards could be used for Language, Country and Currency

Use Standards for Country, Language and Currency Codes

adidas - adidas API design guidelines

Common Data Types

data, time, interval, duration, timestamps, language, country code, currency