textobject — A wrapper for a text description of an object and its associated meta-information.


textobject ::= [-]


A textobject is a wrapper containing a textual description of a media object and its associated meta-information. A textobject is only allowed in mediaobject as a fallback. It cannot be the primary content.

There are two different forms of textobject, and it is not unreasonable for a media object to contain both of them.

In the first form, the content of a textobject is simply a phrase. This form is a mechanism for providing a simple “alt text” for a media object. The phrase might be used, for example, as the value of the alt attribute on an HTML img, with the primary content of the image coming from one of the other objects in the media object.

In the second form, the content of textobject is a longer, prose description. This form could be used when rendering to devices that are incapable of displaying any of the other alternatives.

Processing expectations

May be formatted inline or as a displayed block, depending on context. It might not be rendered at all, depending on its placement within a mediaobject or inlinemediaobject and the constraints on the publishing system. For a more detailed description of the semantics involved, see mediaobject.


The following elements occur in textobject: address, anchor, bibliolist, blockquote, bridgehead, calloutlist, dialogue, drama, epigraph, equation, example, figure, formalpara, glosslist, indexterm (db.indexterm.endofrange), indexterm (db.indexterm.singular), indexterm (db.indexterm.startofrange), info (db.titleforbidden.info), informalequation, informalexample, informalfigure, informaltable, itemizedlist, literallayout, mediaobject, note, orderedlist, para, phrase (db.phrase), poetry, procedure, qandaset, remark, revhistory, sidebar, simpara, simplelist, table, task, textdata, variablelist.

Last revised by Norman Walsh on (git hash: c3457cab689d8fd89ba4252de204cf9a14e40acd 6a501344525f32f9834f0e4a5c3c3f8131803fa4 47fe34b28bad7941a61b9c1c17d47f6eed36cd04)