Type of publication identifier or the organization or system that defined the identifier.
This attribute is used in several contexts:
|Text, numbers, or special characters||The type of identifier “doi” or name or type of organization that created the identifier, such as “aggregator”.|
Best Practice: The type of identifier should be named for established types (DOIs, SICIs, Codens). If the identifier is not of an established type, name the assigning agency (PMC, OCLC) or type of assigning agency (aggregator, archive, indexing service, publisher) which assigned the identifier. Potential values include:
Generic article accession identifier for interchange and retrieval between archives
arXiv archive of electronic preprints
Obsolete PDB/CCDC identifier (may be present on older articles)
Directory of Open Access Journals
Digital Object Identifier
International Standard Book Number
Identifier assigned to a manuscript
NLM Medline identifier
PubMed Central identifier
PubMed ID; see http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed
Publisher’s identifier, such as an “article-id”, “artnum”, “identifier”, “article-number”, “pub-id”, etc.
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.)
The official number of a standard, from a standards body such as ISO, NISO, IEEE, ASME, et al., for example, “Z39.96-2012”.