Dear Ramona and others, thank you for the interesting comments. I would just like to add a few clarifications.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.Actually, DOI includes a set of “relators" [see http://www.doi.org/doi_handbook/5_Applications.html#5.6 ] that goes well beyond the simple “related resources":doi:IsDerivedFromdoi:IsManifestationOfdoi:HasSubjectdoi:IsReplacementFordoi:IsPartOfdoi:HasContributorand this list is just the recommended minimum as explained in the rest of the paragraph.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 registriesXML is mandated for the DOI Kernel metadata, i.e. the small set of fields that need to be registered in the DOI central registry to allow identification a some basic interoperability. Essentially, it just lets users understand what kind of entity the DOI refers to. The metadata description available in the system to which the DOI “belongs” is completely up to the system. You do not need to be a Registration Agency to use your own metadata description, the only requirement is being able to extract a DOI Kernel metadata record.M
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