assigning-authority Authority Responsible for an Identifier

Names the authority (such as Crossref, GenBank, or PDB) that assigned the identifier or is responsible for the identifier.

Usage/Remarks

This attribute should be used to record the assigning authority for metadata such as keywords and subjects and for identifiers (such as <pub-id> to record that a is DOI assigned by “figshare”).
The agency identified as an assigning authority need not be an SDO or the originating standards body. For example, an indexing service could be hired to index a standard, and that indexer could be named in this attribute.
OPTIONAL on many elements; click for list and usage
Value Meaning
Text, numbers, or special characters The name of the organization assigning the identifier.
Restriction This is an optional attribute; there is no default. The attribute is only used when the authority is known.