Wrapper element for one or more authors, editors, translators, etc., that are named in a cited reference
This element is very similar to the <contrib-group> element in the metadata for books and book components. It would have been nice to design the NCBI Book DTD and NCBI Collection DTDs in such a way that there was just one element that could be used inside both the metadata and inside a citation. But using the same name for both elements was not possible, since the content of the two elements is different, and these are DTDs, not schemas. (Note: Some schema languages could accommodate such context-related model differences.)
<!ELEMENT person-group %person-group-model; >
Any combination of:
...<ref-list> <title>References</title> <ref id="bid.41"> <label>1</label> <citation> <person-group> <name><surname>Olson</surname><given-names>M</given-names></name> ... </person-group> <article-title>A common language for physical mapping of the human genome</article-title> <source>Science</source> <year>1989</year> <volume>245</volume> <issue>4925</issue> <fpage>1434</fpage> <lpage>1435</lpage> <pub-id pub-id-type="pmid">2781285</pub-id> </citation> </ref> </ref-list>...