A container element for the volume metadata for a book in a collection, for example, to hold the <volume-number>. This element may repeat, with a different language for each set of volume data or a different usage.
Volume information for books, encyclopedias, and book series is not the same kind of “volume” as the <volume> that is part of the NISO JATS journal metadata. Large works such as an encyclopedia may be divided into physical, logical, or semantic volumes. A book may be published as a monograph as well as part of one or more collections or monographic series. So volume information is needed at the series (collection) level. In addition, books of articles are published that are similar to the <volume> in a journal article and such volume metadata needs to be specified at the book level.
<!ELEMENT volume-in-collection
%volume-in-collection-model; >(volume-number?, volume-title?)
The following, in order:
...
<collection-meta>
<title-group>
<title>Balisage Series on Markup Technologies</title>
</title-group>
<volume-in-collection>
<volume-number>10</volume-number>
<volume-title>Proceedings of Balisage: The Markup Conference
2013</volume-title>
</volume-in-collection>
<issn>1947-2609</issn>
<publisher>
<publisher-name>Mulberry Technologies, Inc.</publisher-name>
</publisher>
<abstract>
<p>The <italic>Balisage Series on Markup Technologies</italic>
is an occasional series that includes the proceedings of
conferences, symposia, and other markup-related events.</p>
</abstract>
</collection-meta>
...