<chem-struct> Chemical Structure (Display)

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


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.

Base Attributes

Linking Attributes

xlink:type (fixed value = simple)


xmlns:xlink (fixed value = http://www.w3.org/1999/xlink)
Models and Context
May be contained in
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 | 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>
  <title>Acesulfame K<break/>
   Dioxide Potassium Salt</title>
  <graphic xmlns:xlink="http://www.w3.org/1999/xlink"