Names the authority (such as CrossRef, Gen Bank, or PDB) that assigned the identifier or
is responsible for the identifier
Remarks
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 semanti
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.