Describes the type of external link; may include a specific source (for example, “ pdb ”, “ pir ”), identifier type (for example, “ doi ”), or access method (for example, “ ftp ”, “ uri ”).
| Value | Meaning |
|---|---|
| Text, numbers, or special characters | The type of link, for example, “ ftp ” or “ uri ” |
| Restriction: This attribute may be specified if the element is used. | |
If the external source is not in the list below, the type of link (DOI, AOI) or type of access (ftp, URI) should be named.
|
aoi |
Astronomical Object Identifier |
|
doi |
Digital Object Identifier |
|
ec |
Enzyme nomenclature; see http://www.chem.qmw.ac.uk/iubmb/enzyme/ |
|
ftp |
File Transfer Protocol |
|
gen |
GenBank identifier |
|
genpept |
Translated protein-encoding sequence database |
|
highwire |
HighWire Press intrajournal |
|
nlm-ta |
NLM title abbreviation |
|
pdb |
Protein Data Bank; see http://www.rcsb.org/pdb/ |
|
pgr |
Plant Gene Register; see http://www.ebi.ac.uk/~textman/pgr-htdocs/pgr/b |
|
pir |
Protein Information Resource; see http://pir.georgetown.edu |
|
pirdb |
Protein information resource; see http://pir.georgetown.edu |
|
pmcid |
PubMed Central identifier |
|
pmid |
PubMed identifier |
|
sprot |
Swiss-Prot; see http://www.ebi.ac.uk/swissprot/ |
|
uri |
Website or web service |