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<ref> Reference Item

One item in a bibliographic list.

Usage/Remarks

A <ref> is typically a citation describing a referenced work (see Tagging References). This Tag Set allows notes as well as citations in a bibliographic list, but best practice is to place notes in a <fn-group> or <notes> section and use <ref-list> only for bibliographic citations.
Attributes
content-type
specific-use

Base Attributes

id
xml:base
xml:lang
Models and Context
May be contained in
<ref-list>
Description
The following, in order:
Content Model
<!ELEMENT  ref          %ref-model;                                  >
Expanded Content Model

(label?, (citation-alternatives | element-citation | mixed-citation | nlm-citation | note)+)

Tagged Samples
Citations inside <ref>
Mixed citations
...
<back>
 <ack>...</ack>
 <ref-list>
  <ref id="B1">
   <mixed-citation publication-type="commun" publication-format="web">
    <string-name><surname>Harris</surname>,
    <given-names>Pat</given-names></string-name>, <role>author</role>.
    <article-title>New Z39.50 resource</article-title> [Internet].
    <source>Message to: Karen Patrias</source>.
    <date-in-citation content-type="time-stamp"
    iso-8601-date="1998-02-27T13:18">1998 Feb 27, 1:18 pm</date-in-citation>
    [cited <date-in-citation content-type="access-date"
    iso-8601-date="1998-02-28">1998 Feb 28</date-in-citation>].
    [about 2 screens].</mixed-citation>
  </ref>
  <ref id="B2">...</ref>
  ...
 </ref-list>
</back>
...
Element citations 
...
<back>
 <ack>...</ack>
 <ref-list>
  <ref id="B1">
   <element-citation publication-type="commun" publication-format="web">
    <person-group person-group-type="author">
     <name><surname>Harris</surname>
      <given-names>Pat</given-names></name>
    </person-group>
    <article-title>New Z39.50 resource</article-title>
    <comment>[Internet]</comment>
    <source>Message to: Karen Patrias</source>
    <date-in-citation content-type="time-stamp"
      iso-8601-date="1998-02-27T13:18">1998 Feb 27, 1:18 pm</date-in-citation>
    <date-in-citation content-type="access-date"
      iso-8601-date="1998-02-28">[cited 1998 Feb 28]</date-in-citation>
    <comment>[about 2 screens]</comment>
   </element-citation>
  </ref>
  <ref id="B2">...</ref>
  ...
 </ref-list>
</back>
...
Notes (<note>) inside <ref> 
...
<ref id="c33">
 <label>33.</label>
 <note>
  <p>While the samples appear homogeneous in terms of local variations in 
   transition energy and PL intensity, the response to external electric fields 
   is strongly inhomogeneous, which can most likely be attributed to local 
   variations in the AlGaN back contact conductivity as well as inhomogeneities 
   in the passivation process.</p>
 </note>
</ref>
...
...
<ref id="c35">
 <label>35.</label>
 <note>
 <p>The geometric optimization and electronic transport properties are 
  all calculated by a developed <italic>ab-initio</italic> software package 
  Atomistix ToolKit, which is based on the spin-polarized density-functional 
  theory combined with the non-equilibrium Greens functions. ...</p>
 </note>
</ref>
...
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