The date on which the work which is cited was examined
Some online resources are changing so quickly that a citation to the resource is not complete without the date on which the cited resource was examined, since a day before or a day later, the relevant material might be different.
For extensive examples of formatted <nlm-citation>s including use of <access-date>s in <nlm-citation>s, see: Sample PubMed Central Citations. To see tagged versions of these examples, see: Sample PubMed Central Citations - XML Tagged.
<!ELEMENT access-date (#PCDATA %access-date-elements;)* >
Any combination of:
<citation> Citation; <nlm-citation> NLM Citation Model; <product> Product Information; <related-article> Related Article Information
In a bibliographic reference (punctuation and spacing removed):
<article>
<front>...
</front>
<body>...
</body>
<back>
<ref-list>
...
<ref>
<citation citation-type="web">
<source>Hypertension, Dialysis & Clinical
Nephrology</source>
<comment>[Internet]</comment>
<publisher-loc>Hinsdale (IL)</publisher-loc>
<publisher-name>Medtext, Inc.</publisher-name>
<year>c1995–2001</year>
<comment>Available from: <ext-link ext-link-type="url"
xlink:href="www.medtext.com/hdcn.htm">
http://www.medtext.com/hdcn.htm</ext-link></comment>
<access-date>[cited 2001 Mar 8]</access-date>
</citation>
</ref>
</ref-list>
</back>
</article>
In a bibliographic reference (punctuation and spacing preserved):
<article>
<front>...
</front>
<body>...
</body>
<back>
<ref-list>
...
<ref>
<citation citation-type="web">
<source>Hypertension, Dialysis & Clinical
Nephrology</source>
<comment>[Internet]</comment>.
<publisher-loc>Hinsdale (IL)</publisher-loc>:
<publisher-name>Medtext, Inc.</publisher-name>;
<year>c1995–2001</year>.
<comment>Available from: <ext-link ext-link-type="url"
xlink:href="www.medtext.com/hdcn.htm">
http://www.medtext.com/hdcn.htm</ext-link></comment>
<access-date>[cited 2001 Mar 8]</access-date>.
</citation>
</ref>
</ref-list>
</back>
</article>
references.ent