Schema Documentation - DIAGRAM Description Profile
version 1.0

The longdesc element

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The longdesc element contains the primary description of the associated image, graphic or visually-oriented structure.

The longdesc should contain a comprehensive explanation of the referenced item. See the summary element for information on how to include a compact description.

Usage Example

<d:longdesc xml:id="longdesc01">
    <p>The diagram shows the processes of evaporation, condensation, evapotranspiration, water 
        storage in ice and snow, and precipitation…</p>
    <p>The parts of the diagram, from upper left, moving across the top to the right are: a mountain 
        showing water storage as ice and snow, the sky, clouds and the sun; in the lower right and 
        moving to the left across the bottom to the left are: the ocean…</p>
</d:longdesc>

Allowed parents

d:body

Allowed children

This element may contain text.

This element may contain the following children: abbr, annoref, annotation (block variant), annotation (phrase variant), aside, block, ssml:break, caption, char, citation (block variant), citation (phrase variant), code (block variant), code (phrase variant), d, definition, description, d:description, emph (text variant), emph (phrase variant), expansion, hd, rend:linebreak, list, ln, m:math, name, note (block variant), note (phrase variant), noteref, num, object (block variant), object (text variant), object (phrase variant), p, pagebreak, ssml:phoneme (text variant), ssml:phoneme (phrase variant), ssml:prosody (text variant), ssml:prosody (phrase variant), quote (block variant), quote (phrase variant), ref, its:ruby, s, ssml:say-as (text variant), ssml:say-as (phrase variant), span (text variant), span (phrase variant), sub, ssml:sub (text variant), ssml:sub (phrase variant), sup, table, term, time, ssml:token (text variant), ssml:token (phrase variant), verse and w

Content model and additional requirements

optional attributes: @about, @by, @class, @content, @continuation, @datatype, @desc, @its:dir, @its:translate, @property, @rel, @resource, @rev, @role, @ssml:onlangfailure, @typeof, @xml:base, @xml:id, @xml:lang and @xml:space
a choice of
either one or more of
any of the 19 elements: annotation, aside, block, caption, citation, code, d:description, description, hd, list, m:math, note, object, p, pagebreak, quote, ssml:break, table and verse
or one or more of
a choice of
either one of the 45 elements: abbr, annoref, annotation, char, citation, code, d, definition, emph, emph, expansion, its:ruby, ln, m:math, name, note, noteref, num, object, object, pagebreak, quote, ref, rend:linebreak, s, span, span, ssml:break, ssml:break, ssml:phoneme, ssml:phoneme, ssml:prosody, ssml:prosody, ssml:say-as, ssml:say-as, ssml:sub, ssml:sub, ssml:token, ssml:token, sub, sup, term, time, w or w
or text
end of choice
end of choice
Note that in addition to restrictions presented in the content model above, use of this element must also respect the following requirement:
  • The longdesc element must neither be empty nor contain only whitespace.
Such requirements take precedence over any conflicting statements in the content model or in the lists above of allowed children and parents.

Namespace

http://www.daisy.org/ns/z3998/authoring/features/description/