Date this article was published or released in one particular format, for example, as an preprint electronic document
As part of the article metadata, the <pub-date> is allowed to repeat; each repetition can take a @pub-type attribute to distinguish which form of publication, for example, print publication, preprint distribution, electronic publication, etc.
While most publication dates will either be a season and a year (e.g., Spring 1999) or a year with a possible day and month (e.g., January 1, 1999), sometimes the publication date will identify both the season and date. A publication date of “Spring 1999; January 29, 1999” should be tagged:
<pub-date pub-type="pub"> <season>Spring</season> <day>29</day> <month>01</month> <year>1999</year> </pub-date>
<!ELEMENT pub-date %pub-date-model; >
(day | month | year | season | string-date | x)*
Any combination of:
... <article-meta> <article-id pub-id-type="pmid">...</article-id> <title-group>...</title-group> <contrib-group>...</contrib-group> <aff id="StLukes">...</aff> <pub-date pub-type="pub"> <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"> <day>29</day> <month>01</month> <year>1999</year></date> </history> <permissions> <copyright-statement>Copyright © 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> ...