Wrapper element for a chemical expression, reaction, chemical equation, etc. that is set apart within the text, and for any number, label, or 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.
The following, in order:
No sample is available at this time because this element is rare in STM journal publishing; it is more commonly used in STM books.