Number of a journal (or other document) within its series
For a detailed discussion on the use of <volume>, see Ordinal Numbers.
The <volume> element is used in two contexts: 1) as a part of the metadata describing the article itself, and 2) as part of a description of a cited work inside a bibliographic reference (<element-citation> or <mixed-citation>).
<!ELEMENT volume (#PCDATA %volume-elements;)* >
(#PCDATA)*
Text, numbers, or special characters, zero or more
<article-meta>, <element-citation>, <front-stub>, <mixed-citation>, <nlm-citation>, <product>, <related-article>, <related-object>
In article metadata:
...
<article-meta>
<article-id pub-id-type="pmid">10092260</article-id>
<title-group>
<article-title>Systematic review of day hospital care
for elderly people</article-title>
</title-group>
<contrib-group>...</contrib-group>
<aff>...</aff>
<author-notes>...</author-notes>
<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-statement>
<copyright-year>...</copyright-year>
</permissions>
<abstract>...</abstract>
</article-meta>
...
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