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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.
NLM DTD Historical Note
This element (<chem-struct>) was significantly remodeled from previous versions of this Tag Set. The current NISO JATS values are backward compatible with all JATS versions and with the last NLM version, but not with earlier NLM DTD versions. Specifically, in prior versions the <chem-struct> element was allowed inside the <app>, <app-group>, <body>, <boxed-text>, <disp-quote>, <fig>, <glossary>, <ref-list>, <sec>, <supplementary-material>, and <table-wrap> elements; in those places, it has been replaced by the <chem-struct-wrap> element.
Only <license-p>, <named-content>, <p>, and <styled-content> elements can contain either <chem-struct> or <chem-struct-wrap>.
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

Multi-lang Attributes

lang-focus
lang-focus-custom
lang-group
lang-source
lang-source-custom
lang-translate
lang-variant
lang-variant-custom

Base Attributes

id
xml:base
xml:lang

Linking Attributes

xlink:actuate
xlink:href
xlink:role
xlink:show
xlink:title
xlink:type

Namespaces

xmlns:xlink
Models and Context
May be contained in
<alternatives>, <alt-title>, <article-title>, <attrib>, <bold>, <chapter-title>, <chem-struct-wrap>, <comment>, <compound-kwd-part>, <compound-subject-part>, <conf-theme>, <def-head>, <disp-formula>, <element-citation>, <fixed-case>, <inline-formula>, <italic>, <license-p>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <overline>, <p>, <part-title>, <product>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <source>, <strike>, <styled-content>, <sub>, <subject>, <subtitle>, <sup>, <supplement>, <support-source>, <td>, <term>, <term-head>, <th>, <title>, <trans-source>, <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 | overline | roman | sans-serif | sc | strike | underline | ruby | object-id | def-list | list | code | graphic | media | preformat | fn | target | xref | sub | sup)*

Tagged Sample

Alternative to <graphic> 

...
<chem-struct-wrap>
 <caption>
  <p>Chemical equation for the oxidation of glucose into
   cardon dioxide and water. Unlike combustion, metabolic
   pathways involving glycolysis and respiration control
   the release of energy during oxidation, thereby permitting
   its storage in ATP molecules.  This slow release of energy
   via chain reactions with multiple steps can be grouped
   into four stages.</p>
 </caption>
 <alternatives>

  <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
    xlink:href="pq0209587032" specific-use="internet"/>

  <chem-struct>C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> &plus;
   6 O<sub>2</sub> &xrarr; 6 CO<sub>2</sub> &plus; 6 H<sub>2</sub>O
  </chem-struct>

 </alternatives>
</chem-struct-wrap>
...
Related Resources