Supplementary Material


Additional data files that contain information directly supportive of the document, for example, an audio clip, movie, database, spreadsheet, applet, or other external file.

This element has a similar function to the audiovisual element in some DTDs and the unprinted-item element (used only for electronic files) in other DTDs.


The element is used in two senses: first, inside the article front matter as an alert to the existence of supplementary material; and second, as part of the textual flow, where it is similar to a Figure, in that it can be positioned as a floating or anchored object and may take a caption. In addition, the <supplementary-material> may identify its file type with the mimetype attribute.

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.

Authoring Note: Supplementary Material may contain a preview image (e.g., the first frame of a movie, tagged as a <graphic>), with the caption/preview placed in a manner similar to a Figure and a cross-reference made to the material from the text.


id Identifier
mimetype Mime Type
position Position
xlink:actuate Actuating the Link
xlink:href Href (Linking Mechanism)
xlink:role Role of the Link
xlink:show Showing the Link
xlink:title Title of the Link
xlink:type Type of Link
xml:lang Language
xmlns:xlink XLink Namespace Declaration

Related Elements

See <inline-supplementary-material> for a simpler form that can be used to mark up text references to supplementary material where the reference appears in the regular flow of the text and does not have a preview image or separate caption.

Some DTDs make the distinction between still graphical objects and audiovisual objects such as pronunciation files and DVD movies. That distinction can be preserved in this DTD by using the <graphic> element for still images and the <supplementary-material> element for all other audiovisual objects. However, some DTDs will use the <graphic> element for all such auxiliary file types and that will be reflected in the tagging when converted.

Model Description

The following, in order:

Tagged Example

<title>Supplemental Material</title>
<p>Movie clips to supplement this article are available
online at <ext-link ext-link-type="uri">radiographics.rsnajnls.org/cgi/content/full/21/4/943/DC1
<p>Anterior fontanelle imaging has traditionally
been the mainstay of neonatal cranial ultrasonography
(US). However, this traditional approach has limited
diagnostic accuracy, ...</p>...