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<chem-struct> Chemical Structure (Display)

Chemical expression, reaction, equation, etc. that is set apart within the text.

Usage/Remarks

This element accommodates chemical reactions expressed in many ways: as text with emphasis tags, subscripts, and superscripts; as a preformatted area (<preformat>); as an included graphic; etc. The linking attributes may also be used to point to an external source such as a URI.
Display/Formatting Note
A chemical structure is assumed to be anchored at its position within the text.
Related Elements
The expression of a chemical reaction or other chemical structure goes inside the <chem-struct> element. The related element <chem-struct-wrap> is an outer wrapper that may hold, for example, both a chemical reaction and its caption or three related chemical expressions.
Attributes
content-type
hreflang
specific-use

Base Attributes

id
xml:base
xml:lang

Linking Attributes

xlink:actuate
xlink:href
xlink:role
xlink:show
xlink:title
xlink:type (fixed value = simple)

Namespaces

xmlns:xlink (fixed value = http://www.w3.org/1999/xlink)
Models and Context
May be contained in
<addr-line>, <alternatives>, <alt-title>, <article-title>, <attrib>, <award-id>, <bold>, <chapter-title>, <chem-struct-wrap>, <collab>, <comment>, <compl>, <compound-kwd-part>, <compound-subject-part>, <def-head>, <disp-formula>, <element-citation>, <fixed-case>, <full>, <funding-source>, <inline-formula>, <intro>, <italic>, <label>, <license-p>, <main>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <overline>, <p>, <part-title>, <related-term>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <see-also-entry>, <see-entry>, <source>, <strike>, <styled-content>, <sub>, <subject>, <subtitle>, <sup>, <supplement>, <tbx:crossReference>, <tbx:definition>, <tbx:entailedTerm>, <tbx:example>, <tbx:externalCrossReference>, <tbx:note>, <tbx:pronunciation>, <tbx:see>, <tbx:source>, <tbx:term>, <tbx:usageNote>, <td>, <term>, <term-display-string>, <term-head>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <verse-line>
Description
Any combination of:
Content Model
<!ELEMENT  chem-struct  %chem-struct-model;                          >
Expanded Content Model

(#PCDATA | alt-text | long-desc | email | ext-link | uri | break | bold | fixed-case | italic | monospace | num | overline | roman | sans-serif | sc | strike | underline | ruby | label | inline-graphic | private-char | inline-code | inline-media | def-list | list | tex-math | mml:math | named-content | styled-content | alternatives | array | code | graphic | media | preformat | fn | target | tbx:entailedTerm | xref | sub | sup)*

Tagged Samples
Inline with text 
...
<p>... Each mL of 0.1 N perchloric acid is equivalent to 20.12 mg 
of <chem-struct>C<sub>4</sub>H<sub>4</sub>KNO<sub>4</sub>S</chem-struct>.</p>
...
Alternative to <graphic> 
...
<chem-struct-wrap>
 <caption>
  <title>Acesulfame K<break/>
   6-Methyl-1,2,3-oxathiazine-4(3H)-one-2,2 
   Dioxide Potassium Salt</title>
  <p>...</p>
 </caption>
 <alternatives>
  <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
    xlink:href="mul1235456"/>
  <chem-struct>C<sub>4</sub>H<sub>4</sub>KNO<sub>4</sub>S</chem-struct>
  ...
 </alternatives>
</chem-struct-wrap>
...