...
<p>The toll of AIDS in Africa far exceeds its proportion
of the world population. Only 12% of the world's population
inhabit Africa, but the continent has over 60% of the
AIDS-infected population. Mortality statistics are complicated
by the relationship between Tuberculosis and HIV.
<related-object source-id="http://www.ncbi.nlm.nih.gov/entrez/
query.fcgi?cmd=Retrieve&amp;dopt=Expanded&amp;db=nlmcatalog&amp;list_uids=1252893"
source-id-type="url" source-type="book">
<person-group person-group-type="editor">
<name><surname>Jamison</surname>
<given-names>Dean T.</given-names></name>
...
</person-group>
<source>Disease and Mortality in Sub-Saharan Africa</source>
<edition>2</edition><sup>nd</sup>
<publisher-name>The World Bank</publisher-name>
<publisher-loc>Washington, DC</publisher-loc>
<year>2006</year>
<isbn>0-8213-6397-2</isbn>
<size units="page">416</size>
</related-object>
</p>
...

...
<ref>
<element-citation publisher-type="gov">
<person-group person-group-type="author">
<name><surname>Lapeyre</surname>
<given-names>Deborah A.</given-names>
</name>
<name><surname>Usdin</surname>
<given-names>B. Tommie</given-names>
</name>
</person-group>
<source>Wildflowers of the Washington Area</source>
<year>2002</year>
<publisher-name>Lippman, Ltd.</publisher-name>
<publisher-loc>Bethesda, MD</publisher-loc>
<isbn>0-23-8675-309</isbn>
<comment>Includes a CD-ROM</comment>
</element-citation>
</ref>
...