Used to mark text that should appear in a special sans-serif font, typically used in math or chemistry
(#PCDATA | ext-link | related-article | inline-supplementary-material | bold | italic | monospace | overline | roman | sans-serif | sc | strike | underline | alternatives | inline-graphic | mml:math | fn | target | xref | sub | sup)*
Any combination of:
<addr-line>, <aff>, <alt-title>, <anonymous>, <article-title>, <attrib>, <award-id>, <bold>, <chapter-title>, <chem-struct>, <collab>, <comment>, <copyright-statement>, <corresp>, <def-head>, <degrees>, <disp-formula>, <edition>, <etal>, <ext-link>, <fax>, <funding-source>, <funding-statement>, <given-names>, <inline-formula>, <inline-supplementary-material>, <institution>, <issue>, <issue-part>, <issue-sponsor>, <issue-title>, <italic>, <journal-subtitle>, <journal-title>, <kwd>, <label>, <license-p>, <mixed-citation>, <monospace>, <named-content>, <on-behalf-of>, <overline>, <p>, <part-title>, <phone>, <prefix>, <preformat>, <price>, <product>, <publisher-loc>, <publisher-name>, <related-article>, <role>, <roman>, <sans-serif>, <sc>, <series>, <series-text>, <series-title>, <sig-block>, <source>, <speaker>, <strike>, <string-name>, <styled-content>, <sub>, <subject>, <subtitle>, <suffix>, <sup>, <supplement>, <surname>, <target>, <td>, <term>, <term-head>, <textual-form>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <verse-line>, <volume>, <xref>
...
<p>... with an <sans-serif>S</sans-serif>-shaped bifurcation
curve ...</p>
...
format3.ent