<chem-struct>
Chemical Structure (Display)
Chemical expression, reaction, equation, etc. that is set apart within the text.
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.
Historical Note: This element (<chem-struct>) was significantly remodeled
from previous versions of this Tag Set. The current NISO JATS values are backwards compatible
with the last NLM version, but not with earlier 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 elements; in those places, it has been
replaced by the 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>.
Attributes
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)*
Description
Any combination of:
- Text, numbers, or special characters
- Accessibility Elements
- Linking Elements
- <break> Line Break
- Emphasis Elements
- <object-id> Object Identifier
- Lists
- <code> Code
- <graphic> Graphic
- <media> Media Object
- <preformat> Preformatted Text
- <fn> Footnote
- <target> Target of an Internal Link
- <xref> X (cross) Reference
- Baseline Change Elements
This element may be contained in:
<alternatives>, <article-title>, <attrib>, <bold>, <chem-struct-wrap>, <comment>, <compound-kwd-part>, <conf-theme>, <def-head>, <disp-formula>, <element-citation>, <fixed-case>, <inline-formula>, <italic>, <license-p>, <mixed-citation>, <monospace>, <named-content>, <overline>, <p>, <product>, <roman>, <sans-serif>, <sc>, <strike>, <styled-content>, <sub>, <subtitle>, <sup>, <supplement>, <td>, <term>, <term-head>, <th>, <title>, <trans-title>, <underline>, <verse-line>
Example
...
<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> +
6 O<sub>2</sub> ⟶ 6 CO<sub>2</sub> + 6 H<sub>2</sub>O
</chem-struct>
</alternatives>
</chem-struct-wrap>
...