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(2) for VLASS, several DOIs will be issued based on product collections (Quick Look (per epoch), Single Epoch (per epoch), Cumulative). Again, these should be displayed prominently in archive searches and on the VLASS science website.
(3) DOI metadata following the DataCite schema (http://schema.datacite.org, for an example see http://archive.stsci.edu/doi/resolve/resolve.html?doi=10.17909/t9-9skz-qw10) should be provided when creating each DOI.