Chemical Structure Wrapper


Wrapper element for a chemical expression, reaction, chemical equation, etc. that is set apart within the text, and for any caption that accompanies the chemical expression. The chemical expressions inside this element may be formally tagged as <chem-struct> elements or merely expressed as one or more graphics.


The position attribute may be used to indicate whether this element must be anchored at its exact location within the text or whether it may float, for example, to the top of the next page, into the next column, to the end of a logical file, or within a separate window.

A <chem-struct-wrapper> does not typically include any number or label since this can be numbered automatically by a formatting application.


content-type Type of Content
id Identifier
position Position

Related Elements

The expression of a chemical reaction or other chemical structure goes inside the <chem-struct> element. The related element <chem-struct-wrapper> is an outer wrapper that may hold, for example, both a chemical reaction and its caption or three related chemical expressions. In other words, this element does not contain a chemical expression; it contains other elements (such as <chem-struct>s) that contain such expressions.

Implementor’s Note: If CML is added, it will go within the related element <chem-struct>.

Model Information

Content Model

<!ELEMENT  chem-struct-wrapper
                        %chem-struct-wrapper-model;                  >


The following, in order:

This element may be contained in:

<app> Appendix; <body> Body of the Article; <boxed-text> Boxed Text; <fig> Figure; <named-content> Named Special (Subject) Content; <p> Paragraph; <sec> Section; <td> Table Data Cell (XHTML table model); <term> Definition List: Term; <th> Table Header Cell (XHTML table model)

Tagged Example

No sample is available at this time, as this element is rare in STM journal publishing, being more commonly used in STM books.