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<roman> Roman

Used to mark text that should remain in roman script no matter what style the surrounding text takes on.

The @toggle attribute can be used to control the behavior of <roman>. When the value of @toggle is set to “no”, the emphasized text remains in roman, no matter what the surrounding text does. In contrast, if the @toggle attribute is set to “yes” on a <roman> element, then if the formatting context imposes roman (whether due to another <roman> element, a stylesheet, some CSS, or other means), then the roman would be turned off within that context, making the emphasized text emphasized by contrast (typographically distinct from its surroundings) but no longer a roman font.

toggle (default = no)

May be contained in

<abbrev>, <addr-line>, <aff>, <alt-title>, <anonymous>, <article-title>, <attrib>, <award-id>, <bold>, <book-title>, <book-volume-id>, <book-volume-number>, <chapter-title>, <chem-struct>, <code>, <collab>, <comment>, <compound-kwd-part>, <compound-subject-part>, <conf-acronym>, <conf-loc>, <conf-name>, <conf-num>, <conf-sponsor>, <conf-theme>, <copyright-statement>, <corresp>, <data-title>, <date-in-citation>, <def-head>, <degrees>, <disp-formula>, <edition>, <element-citation>, <email>, <etal>, <ext-link>, <fax>, <fixed-case>, <funding-source>, <funding-statement>, <given-names>, <gov>, <inline-formula>, <inline-media>, <inline-supplementary-material>, <institution>, <issue>, <issue-part>, <issue-title>, <italic>, <kwd>, <label>, <license-p>, <meta-name>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <nav-pointer>, <on-behalf-of>, <overline>, <p>, <part-title>, <patent>, <phone>, <prefix>, <preformat>, <price>, <product>, <publisher-loc>, <publisher-name>, <rb>, <related-article>, <related-object>, <resource-name>, <role>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <see-also-entry>, <see-entry>, <self-uri>, <series>, <serif>, <sig>, <sig-block>, <source>, <speaker>, <std>, <std-organization>, <strike>, <string-conf>, <string-date>, <string-name>, <styled-content>, <sub>, <subject>, <subtitle>, <suffix>, <sup>, <supplement>, <support-source>, <surname>, <target>, <td>, <term>, <term-head>, <textual-form>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <unstructured-kwd-group>, <uri>, <verse-line>, <version>, <volume>, <volume-id>, <volume-series>, <volume-title>, <x>, <xref>

Any combination of:

Text, numbers, or special characters
Linking Elements
Related Material Elements
<hr> Horizontal Rule
Emphasis Elements
<alternatives> Alternatives For Processing
Inline Display Elements
Inline Math Elements
- <chem-struct> Chemical Structure (Display)
- <inline-formula> Formula, Inline
Math Elements
- <tex-math> TeX Math Equation
- <mml:math> Math (MathML Tag Set)
Other Inline Elements
Internal Linking Elements
<sub> Subscript
<sup> Superscript
<x> X - Generated Text and Punctuation
<break> Line Break

<!ELEMENT  roman        (#PCDATA %emphasized-text;)*                 >

(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | hr | bold | fixed-case | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | serif | strike | underline | underline-start | underline-end | ruby | alternatives | inline-graphic | inline-media | private-char | chem-struct | inline-formula | tex-math | mml:math | abbrev | index-term | index-term-range-end | milestone-end | milestone-start | named-content | styled-content | fn | target | xref | sub | sup | x | break)*

...
<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>
...