I'm writing an importing mechanism for the NAICS database. I have a few questions about this code-format. I've seen it before and I like it the setup. I'm going to ask some other questions about best-practices and navigation of this data, and I'd like to simply refer to it by the right name.
Essentially this is an example of the data
CODE, TITLE "21","Mining, Quarrying, and Oil and Gas Extraction" "212","Mining (except Oil and Gas)" "2121","Coal Mining" "21211","Coal Mining" "212111","Bituminous Coal and Lignite Surface Mining " "212112","Bituminous Coal Underground Mining "
So if Bituminous Coal Underground Mining was your organization type, your code would be
212112. You could look up to find you were in the business-genre of Coal Mining, and up again to find you were in the business of Mining (except Oil and Gas), and up again to find you were in the business of "Mining, Quarrying, and Oil and Gas Extraction".
What is such a scheme called, is there a term to refer to this kind of organization of data?
I want to call something like recursive-base10 or recursive-decimal is there a name of it though?