Used to mark text that should remain in roman script no matter what style the surrounding text takes on.
<!ELEMENT roman (#PCDATA %emphasized-text;)* >
(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | bold | fixed-case | italic | monospace | overline | roman | sans-serif | sc | strike | underline | ruby | alternatives | inline-graphic | chem-struct | inline-formula | abbrev | named-content | styled-content | fn | target | xref | sub | sup)*
Any combination of:
<addr-line>, <aff>, <article-title>, <attrib>, <bold>, <chapter-title>, <chem-struct>, <code>, <collab>, <comment>, <compound-kwd-part>, <conf-theme>, <copyright-statement>, <def-head>, <disp-formula>, <element-citation>, <ext-link>, <fixed-case>, <funding-statement>, <gov>, <inline-formula>, <inline-supplementary-material>, <italic>, <kwd>, <license-p>, <mixed-citation>, <monospace>, <named-content>, <on-behalf-of>, <overline>, <p>, <part-title>, <preformat>, <price>, <product>, <rb>, <related-article>, <related-object>, <roman>, <sans-serif>, <sc>, <series>, <source>, <std>, <strike>, <styled-content>, <sub>, <subtitle>, <sup>, <supplement>, <target>, <td>, <term>, <term-head>, <textual-form>, <th>, <title>, <trans-source>, <trans-title>, <underline>, <verse-line>, <xref>
... <sec> <title>Seasonal Variations of <roman>CO</roman>, <roman>N<sub>2</sub>O</roman>, and <roman>CO<sub>2</sub></roman></title> <p>Recent evidence supports the premise that concentrations of major greenhouse gases vary ...</p> ... </sec> ...
JATS-format1.ent