Names the type of publication identifier, or the organization or system that defined the identifier.
This attribute is used:
| Value | Meaning |
|---|---|
| art-access-id | Generic article accession identifier for interchange and retrieval between archives |
| coden | Obsolete PDB/CCDC identifier (may be present on older articles) |
| doaj | Directory of Open Access Journals |
| doi | Digital Object Identifier |
| isbn | International Standard Book Number |
| manuscript | Identifier assigned to a manuscript |
| pii | Publisher’s internal identifier” is used by some archives, for example, PubMed Central, to mark “any internal reference identifier used in the publishing process [that is] assigned by the publisher”. |
| pmcid | PubMed Central identifier |
| pmid | PubMed ID; see http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed |
| publisher-id | Publisher’s identifier, such as an “article-id”, “artnum”, “identifier”, “article-number”, “pub-id”, etc. |
| sici | Serial Item and Contribution Identifier (An ANSI/NISO Z39.56 code to uniquely identify volumes, articles, or other parts of a periodical. A journal article may have more than one SICI, for example, one for a print version and another for an electronic version.) |
| Restriction: This attribute may be specified if the element is used. | |
| Value | Meaning |
|---|---|
| Data characters | Text, numbers, or special characters. |
| Restriction: This attribute may be specified if the element is used. | |