olemus
(1) statistikas:
agregeerimata individuaaltasemeandmed, näiteks
rahvaloendusel iga isiku kohta kogutud andmed
= data at the level of individual respondents
https://en.wikipedia.org/wiki/Microdata_(statistics)
https://ec.europa.eu/eurostat/web/microdata

(2) HTML:
täpsustav ja sobitav lisamärgistus
= a form of semantic markup that provides additional information about specific elements on a web page
https://en.wikipedia.org/wiki/Microdata_(HTML)
https://www.w3.org/TR/2021/NOTE-microdata-20210128/