For an external link, for example, to an external document or a database, this attribute identifies the type of external link being used (such as a DOI or the URL of a website) or the specific external source to which the link points, such as the protein databank.
Although designed to accept any text as its value, this attribute should be used only if the type of external link is one of the ones defined below.
This list is slightly overloaded in that two different functions are being performed. The first is to name the specific external source, when it is one of the ones named below. If the external source is not one of the ones below, the type of link (DOI, AOI, ftp, uri, etc.) should be named instead.
|
ec |
Enzyme nomenclature; see http://www.chem.qmw.ac.uk/iubmb/enzyme/ |
|
gen |
GenBank identifier |
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genpept |
Translated protein-encoding sequence database |
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highwire |
HighWire press intrajournal |
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medline |
Medline or PubMed identifier |
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pdb |
Protein data bank; see http://www.rcsb.org/pdb/ |
|
pgr |
Plant gene register; see http://www.tarweed.com/pgr/b |
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pir |
Protein information resource; see http://pir.georgetown.edu |
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pirdb |
Protein information resource; see http://pir.georgetown.edu |
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pmc |
Linkage between articles in PubMed Central (Access is PMID.) |
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sprot |
Swiss-Prot.; see http://www.ebi.ac.uk/swissprot/ |
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aoi |
Astronomical object identifier |
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doi |
Digital object identifier |
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ftp |
File transfer protocol |
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uri |
Website or web service |
| Value | Meaning |
|---|---|
| Data characters | Text, numbers, or special characters that name the type of link, for example, “ftp” |
| Restriction: This attribute may be specified if the element is used. | |