Starting from version 0.4.8, our LaTeX style CEURART produces PDF/A-1a. It used to produce PDF/A-3u, but since some national archives would only accept PDF/A-1a, we made this switch. The Word/LibreOffice templates are not affected. We advise authors to configure their Word/LibreOffice suite to also produce PDF/A-1a when creating papers for CEUR-WS.
The change is minor and should not have a great implication. To our knowledge, PDF/A-3u allows to include data tables in the PDF file. Since, no standards for the data formats are defined in PDF/A-3u, such inclusions are less suitable for archival.
If authors need to publish data sets with their papers, we recommend to either use open-access services that issue DOIs/URNs for such data sets and then link to the data sets from within the PDF file. Or authors can use the complex paper format
http://ceur-ws.org/Vol-XXX/paperX/
for publishing papers with small accompanying data sets/source code/models.
N.B. (2022-07-06): While the CEURART style now uses PDF/A-1a, images contained in an actual PDF and included packages and options can lead to a PDF file that is actually not compliant to PDF/A-1a.
Quo vadis CEUR-WS.org? 