DOIs allow for simply linking "related resources", but it would be better to have more explicit ontology classes (e.g., as subclasses of CRID (central registry identifier) in the Ontology for Biomedical Investigations) to define how differnt existing identifiers relate to one another.
The description, or list of metadata elements, is independent of the format and therefore conversion. RDF triples as a base format have the advantage of being lossless, but they don't always scale well. DOI itself specifies XML a standard [1]. [2], but if GLIS sets up its own Registration Agency for DOIs, it would use its own base format, which can then be converted to XML for interactivity with other registries
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