imageobjectco — A wrapper for an image object with callouts
Callouts, such as numbered bullets, are an annotation mechanism. In an
online system, these bullets are frequently “hot,” and clicking on
them navigates to the corresponding annotation.
ImageObjectCO is a wrapper around an
AreaSpec identifies the locations
on the image where the
ImageObjectCO may also contain the list of annotations in
CalloutList, although the
CalloutList may also
occur outside of the wrapper, elsewhere in the document.
Formatted as a displayed block.
It may not be rendered at all, depending on its placement
MediaObject that contains it and
the constraints on the publishing system. For a more detailed description
of the semantics involved, see
The mandatory processing expectations of a
minimal: a system is expected to render the image, if possible, and the
callout list, if present.
In online environments, the processing system may be able to instantiate the linking relationships between the callout marks on the image and the annotations. For example, an HTML presentation system might use the coordinate information to construct a client-side image map. Some processing systems may even be able to go a step further and generate the callout marks automatically from the coordinate information. But this level of sophistication is not mandatory.