Used to mark unstructured text within an otherwise element-structured bibliographic reference; it is therefore not necessarily a comment in the formal sense of commentary. In an unstructured bibliographic reference, this text would merely be a mixture of text, numbers, or special characters, and not marked with tags at all.
The element <comment> is used to contain additional information about a citation that is not appropriate in any of the other, named, information types.
This element was designed primarily for use within the structured citation element <nlm-citation>. Because the model for <citation> is a loose model with data characters allowed everywhere, this element will rarely be needed; its use is therefore deprecated within <citation>.
The <comment> element is used in <nlm-citation> (and, more rarely, <citation>) largely for the sake of conversion, to preserve unusual bits of semantic markup when translating from other tag sets. Typical comments might include:
<comment>[Abstract]</comment> <comment>translated from Russian</comment>
Conversion Note: The <comment> element should be used to mark substantive text only; it should not be used to mark punctuation that occurs between elements.
<!ELEMENT comment (#PCDATA %comment-elements;)* >
Any combination of:
<citation> Citation; <nlm-citation> NLM Citation Model; <related-article> Related Article Information; <related-object> Related Object Information
In a bibliographic reference (punctuation and spacing removed):
... <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> ...
In a bibliographic reference (punctuation and spacing preserved):
... <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> [cited <access-date>2001 Mar 8</access-date>]. </citation> </ref> ...
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