10622/0LMVDB Mourits, Rick J0000-0002-2267-1679(IISG) IISH Data Collection 2025 Historical demographers have designed schemas and vocabularies to standardize historical data. CLAIR-HD gathered these schemes to create an overview of the existing languages used in historical demography. The state of the field was summarised in 2024 by Mourits, Stapel, and Riswick. This database contains - An output table that summarise how variables are named within historical demography. - An output table that shows the existing open access conversion tables. - The documentation of IDS, Mosaic, and Persons in Context on which the schema table is based. See also https://www.ipums.org, https://mosaic.ipums.org/, https://www.nappdata.org/, and https://personsincontext.org/ for more information. - The documentation of the conversion tables on which the conversion table overview is based. The related output table contains links to the relevant produce pages. Please use the tree function for a clear overview of the files. International Institute of Social History