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 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
<element-citation>, <mixed-citation>, <nlm-citation>, <product>, <related-article>, <related-object>
In an element-style bibliographic citation (punctuation and spacing removed):
...
<ref>
<element-citation publication-type="journal">
<person-group>...</person-group>
<article-title>Electrogastrographic study of patients with unexplained
nausea, bloating and vomiting</article-title>
<source>Gastroenterology</source>
<year>1980</year>
<month>08</month>
<volume>79</volume>
<issue>2</issue>
<fpage>311</fpage>
<lpage>314</lpage>
</element-citation>
</ref>
...
In a mixed-style bibliographic citation (punctuation and spacing preserved):
...
<ref>
<mixed-citation publication-type="journal">
<person-group>...</person-group>.
<article-title>Electrogastrographic study of patients with unexplained
nausea, bloating and vomiting</article-title>.
<source>Gastroenterology</source>: <year>1980</year>
<month>08</month> <volume>79</volume>;
<issue>2</issue>; <fpage>311</fpage>
–<lpage>314</lpage>.
</mixed-citation>
</ref>
...
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