## ISO Standards Tag Set (ISOSTS) version 1.0: A customization of NISO JATS version 0.4

#### International Organization for Standardization (ISO)

# ext-link-type

# Type of External Link

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` ”).

## Attribute Values

#### In Elements

##### <ext-link>

##### <related-article>

Value | Meaning
--- | ---
Data characters | Text, numbers, or special characters.
Restriction: This attribute may be specified if the element is used.

#### Suggested usage

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

## ISO Standards Tag Set (ISOSTS) version 1.0: A customization of NISO JATS version 0.4

#### Version of April 2012