As a developer, I would like to make use of CDQ's meta data, so that I do not have to maintain reference data by myself.
The following reference data should be retrievable:
list of countries
legal forms of a country
identifier types of a country
administrative areas of a country
for identifiers the related sap tax field (stcd1, stcd2, stceg etc.) as well as the tax category (DE0, DE1, DE2 etc.) should also be returned
If cities / postal codes of a given country would be available such a service could be used to validate the correctness of addresses (e.g. is a given postal code existing for a given country)