ISO 639-1 is a standardized nomenclature used to classify languages. Each language is assigned a two-letter (639-1) lowercase abbreviation, amended in later versions of the nomenclature.
An identifier a source assigns to a person, such as a member, customer or user id, as the source gives it. Ids join only within the same id space. Never empty or only spaces.
Describes the housing arrangement of an individual or household, indicating whether they own, rent, or live in non-traditional housing situations. Aligned with U.S. Census Bureau tenure definitions and modeled segments.