Where multiple formats of an item (e.g., graphic file, media object, chemical structure) are available, this attribute indicates that a format is a secondary one and provides a link to the primary format, so that only one format of an item is displayed.
Value | Meaning |
---|---|
An identifier (IDREF) | The pointing uses the ID/IDREF mechanism, using this “alternate-form-of” attribute of an element to point to the “ID” attribute of an existing Graphic, Media Object, or other similar element. |
Restriction: This attribute may be specified if the element is used. |