International Standard Serial Number, the international code that uniquely identifies a serial publication title.


The format/medium type of a particular <issn> can be captured using the @publication-format attribute.


Content Model

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

Expanded Content Model



Text, numbers, or special characters, zero or more

This element may be contained in:

Example 1

As part of the metadata for a journal:
<journal-id journal-id-type="pmc">BMJ</journal-id>
<journal-id journal-id-type="publisher">BR MED J</journal-id>
<publisher-name>British Medical Journal</publisher-name>
<article-id pub-id-type="pmid">10092260</article-id>
<article-title>Systematic review of day hospital
care for elderly people</article-title>
<aff id="StLukes">...</aff>
<pub-date publication-format="print" date-type="pub" iso-8601-date="1999-03-27">

Example 2

An article may have more than one <issn>:
<journal-title>Low Temperature Physics</journal-title>
<abbrev-journal-title>Low Temp. Phys.</abbrev-journal-title>
<issn publication-format="print">1063-777X</issn>
<issn publication-format="electronic">1090-6517</issn>