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DocBook: The Definitive Guide

DocBook: The Definitive Guide

By Norman Walsh & Leonard Muellner
1st Edition October 1999
1-56592-580-7, Order Number: 5807
652 pages, $36.95 , Includes CD-ROM



ImageObjectCO -- A wrapper for an image object with callouts


Content Model

ImageObjectCO ::=


Common attributes

Tag Minimization

Both the start- and end-tags are required for this element.


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.

A ImageObjectCO is a wrapper around an AreaSpec and an ImageObject. An AreaSpec identifies the locations (coordinates) on the image where the Callouts occur. The ImageObjectCO may also contain the list of annotations in a CalloutList, although the CalloutList may also occur outside of the wrapper, elsewhere in the document.

Processing expectations

Formatted as a displayed block. It may not be rendered at all, depending on its placement within the MediaObject that contains it and the constraints on the publishing system. For a more detailed description of the semantics involved, see MediaObject.

The mandatory processing expectations of a ImageObjectCO are 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.

(5.0) Future Changes

In DocBook V5.0, ImageObjectCO will be discarded. In its place, use MediaObjectCO.


These elements contain ImageObjectCO: MediaObjectCO.


The following elements occur in ImageObjectCO: AreaSpec, CalloutList, ImageObject.

In some contexts, the following elements are allowed anywhere: BeginPage, IndexTerm.

See Also

AreaSpec, CalloutList, CO, GraphicCO, MediaObjectCO, ProgramListingCO, ScreenCO


For examples, see MediaObjectCO.

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