<ext-link>

External Link

Definition

Link to an external file, such as MEDLINE, GenBank, etc.

Remarks

Use the standard XLink attributes to provide a live link to the external source.

The ext-link-type attribute can be used to give an indication of the type of resource to which the external link points. While the DTD does not constrain the values of this attribute, and ordinary text is acceptable, the suggested values include:

ec

Enzyme nomenclature. See http://www.chem.qmw.ac.uk/iubmb/enzyme/

gen

GenBank identifier

genpept

Translated protein-encoding sequence database

highwire

HighWire Press intrajournal

pdb

Protein data bank. See http://www.rcsb.org/pdb/

pgr

Plant gene register. See http://www.tarweed.com/pgr/

pir

Protein Information Resource. See http://pir.georgetown.edu

pirdb

Protein Information Resource. See http://pir.georgetown.edu

pmc

Used to link between articles in PubMed Central (access is PMID)

sprot

Swiss-Prot. See http://www.ebi.ac.uk/swissprot/

aoi

Astronomical Object Identifier

doi

Digital Object Identifier

ftp

File transfer protocol

uri

Website or web service

Attributes

ext-link-type Type of External Link
id Identifier
xlink:actuate Actuating the Link
xlink:href Href (Linking Mechanism)
xlink:role Role of the Link
xlink:show Showing the Link
xlink:title Title of the Link
xlink:type Type of Link
xmlns:xlink XLink Namespace Declaration

Related Elements

<self-uri> is used when an article is available in multiple forms, for example, as a means of indicating the online version of a print article. Conversely, a URI that indicates a different article or any other kind of external reference is usually tagged with <ext-link>. <uri>, although allowed everywhere <ext-link> is used, is more typically part of an address, information concerning a contributor, or part of a reference citation. Loosely put, an external link <ext-link> is intended to act as a link; a URI <uri> makes no promises but identifies a URI, such as a URL, when it is present in the text of an address or a citation; and self-uri points to another form of the same article.

The address element <email> is allowed as part of a paragraph as well as inside an address. There are two ways to treat an email address in text: as and <email> element or as and <ext-link> element. If both a textual phrase (“the Moody Institute’s email address”) and a mailto URL are required, the <ext-link> element should be used.

The elements used in an address include the address class elements: <addr-line>, <country>, <fax>, <institution>, and <phone> and the address linking class elements: <email>, <ext-link>, and <uri>.

Model Information

Content Model

<!ELEMENT  ext-link     (#PCDATA %ext-link-elements;)*               >

Description

Any combination of:

This element may be contained in:

<address> Address/Contact Information; <aff> Affiliation; <alt-title> Alternate Title; <array> Array (Simple Tabular Array); <article-meta> Article Metadata; <article-title> Article Title; <attrib> Attribution; <bold> Bold; <chem-struct> Chemical Structure (Display); <chem-struct-wrapper> Chemical Structure Wrapper; <citation> Citation; <collab> Collaborative (Group) Author; <comment> Comment in a Citation; <contrib> Contributor; <contrib-group> Contributor Group; <copyright-statement> Copyright Statement; <corresp> Correspondence Information; <def-head> Definition List: Definition Head; <disp-formula> Formula, Display; <fig> Figure; <fig-group> Figure Group; <graphic> Graphic; <inline-supplementary-material> Inline Supplementary Material; <italic> Italic; <media> Media Object; <meta-name> Metadata Data Name for Custom Metadata; <meta-value> Metadata Data Value for Custom Metadata; <monospace> Monospace Text (Typewriter Text); <named-content> Named Special (Subject) Content; <overline> Overline; <p> Paragraph; <preformat> Preformatted Text; <product> Product Information; <publisher-loc> Publisher’s Location; <related-article> Related Article Information; <sans-serif> Sans Serif; <sc> Small Caps; <source> Source; <strike> Strike Through; <sub> Subscript; <subtitle> Article Subtitle; <sup> Superscript; <supplementary-material> Supplementary Material; <table-wrap> Table Wrapper; <table-wrap-group> Table Wrapper Group; <td> Table Data Cell (XHTML table model); <term> Definition List: Term; <term-head> Definition List: Term Head; <th> Table Header Cell (XHTML table model); <title> Title; <trans-source> Translated Source; <trans-subtitle> Translated Subtitle; <trans-title> Translated Title; <underline> Underline

Tagged Examples

Example 1


...
<sec sec-type="intro">
<title>Introduction</title>
<p>... The highest 16S rDNA sequence similarity 
value of 98&amp;amp;#x0025; was obtained for the 
<italic>D. maris</italic> 16S rDNA sequence 
(GenBank accession no. <ext-link ext-link-type="gen"
xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="Y18883"/>) 
and for the <italic>D. maris</italic> DSM 43672<sup>T</sup> 
16S rDNA sequence (GenBank accession no. <ext-link 
ext-link-type="gen" xmlns:xlink="http://www.w3.org/1999/xlink"
xlink:href="X79290"/>) ....</p>
</sec>
...


Example 2


...
<fn id="FN153"><label>&#x000a7;</label><p>Present address:
Washington Biotech, 14256 Howardness Road, Kalamazoo, MI 49007.
<ext-link ext-link-type="email">
<italic>kuse&commat;udel.edu</italic>
</ext-link></p></fn>
...


Module

common.ent