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%pub-id-types; Article/Publication Identifier Types

The @pub-id-type attribute names the type of identifier, or the organization or system that defined an identifier, for an identifier of the document or an identifier of a cited publication or other referenced object. This parameter entity holds an explicit list of values for the @pub-id-type attribute.
Declaration
<!ENTITY % pub-id-types  "accession | archive | ark | art-access-id | 
                          arxiv | coden | doaj | doi | 
                          handle | index | isbn | 
                          manuscript | medline | mr | other | 
                          pii | pmcid |  pmid | publisher-id | sici |
                          std-designation | zbl |
                          custom"                                    >