The
International Organization for Standardization [ISO] (sometimes by means of a
registration authority) maintains and publishes standards for languages, amongst
other things. The
ISO 639-3 standards for languages include a five-way typology to classify languages, including type
H for historical languages. Besides historical languages, there are also ISO 639-3 classifications for: living languages (languages with currently living native speakers); extinct languages (for languages whose last native speaker died within the last few centuries); ancient languages (languages whose last attested native speaker died more than a millennium ago); and
constructed languages (which may or may not have native speakers).
Old English is an example of an historical language. The ISO 639 language code for Old English is ang. A further ISO 639-3 criterion for historic languages is that they have a distinct literature from that of their descendant languages: in the example of Old English,
Beowulf and other works of
Old English literature form a body of material that is distinct from (or within) the broader corpus of English literature. ==See also==