Set of conditions under which the content may be used, accessed, and distributed.
<!ELEMENT license %license-model; >
((license-p)+)
...
<book-meta>
<book-id>...</book-id>
...
<pub-history>...</pub-history>
<permissions>
<copyright-statement>Copyright: © 2004 Eichenberger
et al.</copyright-statement>
<copyright-year>2004</copyright-year>
<license license-type="open-access"
xlink:href="http://creativecommons.org/licenses/by/2.0/">
<license-p>This is an open-access article distributed under the
terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium,
provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract>...</abstract>
</book-meta>
...
...
<book-meta>
...
<permissions>
<copyright-statement>...</copyright-statement>
<license license-type="ccc">
<license-p>0003-6951/2006/88(5)/051101/3/<price>$23.00</price></license-p>
</license>
</permissions>
<abstract>...</abstract>
</book-meta>
...