Authority Responsible for an Identifier
Names the authority (such as CrossRef, GenBank, or PDB) that assigned the identifier or is responsible for the identifier
This attribute should be used to record the assigning authority for publication identifiers (<pub-id>) such as DOIs, which might be assigned by, for example, “crossref” or “figshare”. The attribute can also be used to lessen the semantic overload on the @pub-id-type attribute, by recording the authority such as “GenBank” or “PDB” that assigned the identifier.
This attribute is used (as of this version) on two elements: <pub-id> and <ext-link>. The attribute makes more semantic sense for a publication identifier, but was assigned to <ext-link> to handle those rare cases where an external link, which is a link by definition, codes an identifier, such as a DOI.
An <ext-link> identifying who assigned the DOI:
... <p>In <italic>Developing Thin Clients Using Amphibious Epistemologies</italic> (<ext-link ext-link-type="doi" xlink:href="https://dx.doi.org/10.5555/12345679" assigning-authority="crossref">http://dx.doi.org/10.5555/12345679</ext-link>), Josiah Carberry introduced “Entrust,” a linear-time tool for simulating architecture.</p> ...