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<issue> Issue Number

Issue number of a journal, or in rare instances, a book.

Usage/Remarks

Issue Metadata

Some journal tag sets identify three types of article metadata: that concerning the specific article, that concerning the journal, and that concerning the issue of the journal that contains the article. In this Tag Set, the metadata for the issue and the article has been placed together inside the <article-meta>. In the article metadata, the <issue> is the issue number of the issue in which the article appears.
In Citations
The <issue> element is also used in bibliographic references (<element-citation> and <mixed-citation>) where it indicates the issue in which the cited material was published.
In Joint Issues
If an article was published in a joint issue “Iss. 2-3”, both issue numbers should be placed into a single <issue> element: <issue>1-2</issue>.
Multiple Issue Numbers
The element issue number (<issue>) is allowed to repeat, to handle the rare circumstance in which a publisher has both an issue number within a volume and an issue sequence number (not volume related) within the run of the publication. In such cases, the attribute @content-type should be used to differentiate the two types of issues.
In this example, from an 1971 issue of the Bristol Medico-Chirurgical Journal, the “Vol.” was given as “86”, the issue was given as “i”, and the “No.” as “317”. (See Cover: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5076125/pdf/brmedchirj69728-0001-cov.pdf.) The article metadata was recorded as follows: 
...
<front>
 <journal-meta>
  <journal-title-group>
   <journal-title>Bristol Medico-Chirurgical Journal</journal-title>
  </journal-title-group>
 </journal-meta>
 <article-meta>
  ...
  <pub-date publication-format="print" date-type="pub" iso-8601-date="1971-01">
   <month>1</month><year>1971</year></pub-date>
  <volume>86</volume>
  <issue content-type="volume">1</issue>
  <issue content-type="publication">317</issue>
 </article-meta>
</front>
...
In this example, from the Journal of Medical Research in 1902, the Vol. was given as “VIII”, the “No.” as “2”, and the “Whole No.” as “70”. (See Cover: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2105865/pdf/jmedres00125-0003.pdf and Article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2105865/.) The article metadata was recorded as follows: 
...
<front>
 <journal-meta>
  <journal-title-group>
   <journal-title>The Journal of Medical Research</journal-title>
  </journal-title-group>
 </journal-meta>
 <article-meta>
  ...
  <contrib-group>...</contrib-group>
  <pub-date publication-format="print" date-type="pub" iso-8601-date="1902-11">
   <month>11</month><year>1902</year></pub-date>
  <volume>8</volume>
  <volume content-type="new-series">3</volume>
  <issue content-type="volume">2</issue>
  <issue content-type="publication">70</issue>
  <fpage>309</fpage>
  <lpage>315</lpage>
 </article-meta>
</front>
...
Related Elements
The related element <issue-id> records an identifier for the issue. This <issue> number element is typically just a simple number such as “4” or “35”.
Attributes
content-type
seq
specific-use

Base Attributes

id
xml:base
xml:lang
Models and Context
May be contained in
<article-meta>, <element-citation>, <front-stub>, <mixed-citation>, <nlm-citation>, <product>, <related-article>, <related-object>, <volume-issue-group>
Description
Any combination of:
Content Model
<!ELEMENT  issue        (#PCDATA %issue-elements;)*                  >
Expanded Content Model

(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | hr | bold | fixed-case | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start | underline-end | ruby | alternatives | inline-graphic | inline-media | private-char | chem-struct | inline-formula | tex-math | mml:math | abbrev | index-term | index-term-range-end | milestone-end | milestone-start | named-content | styled-content | fn | target | xref | sub | sup | x)*

Tagged Samples
<article-meta> 
...
<article-meta>
 ...  
 <volume>1540</volume>
 <issue>1</issue>
 <isbn content-type="conf-proc">978-0-7354-1164-7</isbn>
 <fpage seq="1">113</fpage>
 <lpage>124</lpage>
</article-meta>
...
...
<article-meta>
 <article-id pub-id-type="pmid">...</article-id>
 <title-group>...</title-group>
 <contrib-group>...</contrib-group>
 <aff id="StLukes">...</aff>
 <pub-date publication-format="print" date-type="pub" 
   iso-8601-date="1999-03-27">
  <day>27</day>
  <month>03</month>
  <year>1999</year>
 </pub-date>
 <volume>318</volume>
 <issue>7187</issue>
 <fpage>837</fpage>
 <lpage>841</lpage>
 <history>
  <date date-type="accepted" iso-8601-date="2001-01-29">
   <day>29</day>
   <month>01</month>
   <year>1999</year>
  </date>
 </history>
 <permissions>
  <copyright-statement>Copyright &#x00A9; 1999, British
   Medical Journal</copyright-statement>
  <copyright-year>1999</copyright-year>
  <copyright-holder>British Medical Journal</copyright-holder>
 </permissions>
 <abstract>
  <p>To examine the effectiveness of day hospital
   attendance in prolonging independent living for
   elderly people.</p>
 </abstract>
</article-meta>
...
In citations
Mixed citation
...
<ref id="G3">
 <mixed-citation publication-type="journal" publication-format="print">
  <string-name><surname>Llanos De La Torre Quiralte</surname>
  <given-names>M</given-names></string-name>,
  <string-name><surname>Garijo Ayestaran</surname>
  <given-names>M</given-names></string-name>,
  <string-name><surname>Poch Olive</surname>
  <given-names>ML</given-names></string-name>.
  <article-title xml:lang="es">Evolucion de la mortalidad
  infantil de La Rioja (1980-1998)</article-title>
  [<trans-title xml:lang="en">Evolution of the infant
  mortality rate in la Rioja in Spain (1980-1998)</trans-title>].
  <source>An Esp Pediatr</source>. <year iso-8601-date="2001-11">2001</year>
  <month>Nov</month>;<volume>55</volume>(<issue>5</issue>):
  <fpage>413</fpage>-<lpage>420</lpage>. Figura 3, Tendencia
  de mortalidad infantil [Figure 3, Trends in infant
  mortality]; p. 418. Spanish.</mixed-citation>
</ref>
...
Element citation
...
<ref id="G3">
 <element-citation publication-type="journal" publication-format="print">
  <name><surname>Llanos De La Torre Quiralte</surname>
   <given-names>M</given-names></name>
  <name><surname>Garijo Ayestaran</surname>
   <given-names>M</given-names></name>
  <name><surname>Poch Olive</surname>
   <given-names>ML</given-names></name>
  <article-title xml:lang="es">Evolucion de la mortalidad
   infantil de La Rioja (1980-1998)</article-title>
  <trans-title xml:lang="en">Evolution of the infant
   mortality rate in la Rioja in Spain
   (1980-1998)</trans-title>
  <source>An Esp Pediatr</source>
  <year iso-8601-date="2001-11">2001</year>
  <month>Nov</month>
  <volume>55</volume>
  <issue>5</issue>
  <fpage>413</fpage>
  <lpage>420</lpage>
  <comment>Figura 3, Tendencia de mortalidad infantil
   [Figure 3, Trends in infant mortality]; p. 418.
   Spanish</comment>
 </element-citation>
</ref>
...
Multiple issue numbers 
...
<front>
 <journal-meta>
  <journal-title-group>
   <journal-title>Bristol Medico-Chirurgical Journal</journal-title>
  </journal-title-group>
 </journal-meta>
 <article-meta>
  ...
  <pub-date publication-format="print" date-type="pub" iso-8601-date="1971-01">
   <month>1</month>
   <year>1971</year>
  </pub-date>
  <volume>86</volume>
  <issue content-type="volume">1</issue>
  <issue content-type="publication">317</issue>
 </article-meta>
</front>
...