data-about

The <data-about> element identifies the subject of a property when the subject isn't associated with the context in which the property is specified. The property itself is expressed by the <data> element. The <data-about> element handles exception cases where a property must be expressed somewhere other than inside the actual subject of the property. The <data-about> element is particularly useful as a basis for specialization in combination with the <data> element.

Important: Do not use the <data-about> element to identify the object of a property. The href attribute of the <data> element serves that purpose.

Example

The full properties of a cited book can be maintained conveniently in the prolog:

<topic id="questions">
    <title>Questions and answers</title>
    <prolog>
        <data-about name="book" href="urn:isbn:0156983508">
            <data name="title">The World Doesn't End</data>
            <data name="author">
                <data name="firstname">Charles</data>
                <data name="lastname">Simic</data>
            </data>
            <data name="published" datatype="year">1989</data>
            ...
        </data-about>
        ...
    </prolog>
    <body>
        ...
       <lq href="urn:isbn:0156983508">In a forest of question marks ...
       </lq>
       ...
    </body>
</topic>

Contains

Doctype	Content model
ditabase, topic, task, reference, concept, glossary, map, bookmap	( ( data) then ( data or data-about) (any number) )

Contained by

Doctype	Parents
bookmap	data-about, data, title, shortdesc, desc, p, note, lq, q, sli, li, itemgroup, dthd, ddhd, dt, dd, fig, pre, lines, ph, alt, stentry, draft-comment, fn, indexterm, index-base, cite, xref, entry, author, source, publisher, copyrholder, category, prodname, brand, series, platform, prognum, featnum, component, map, topicref, relcell, topicmeta, linktext, searchtitle, person, organization, summary, printlocation, bookpartno, booknumber, topichead, topicgroup, index-see, index-see-also, index-sort-as, organizationname, otherinfo, addressdetails, locality, localityname, administrativearea, thoroughfare, emailaddress, url
map	data-about, data, title, shortdesc, desc, p, note, lq, q, sli, li, itemgroup, dthd, ddhd, dt, dd, fig, pre, lines, ph, alt, stentry, draft-comment, fn, indexterm, index-base, cite, xref, entry, author, source, publisher, copyrholder, category, prodname, brand, series, platform, prognum, featnum, component, map, topicref, relcell, topicmeta, linktext, searchtitle, topichead, topicgroup, index-see, index-see-also, index-sort-as
ditabase	data-about, data, title, shortdesc, desc, p, note, lq, q, sli, li, itemgroup, dthd, ddhd, dt, dd, fig, pre, lines, ph, alt, stentry, draft-comment, fn, indexterm, index-base, cite, xref, entry, author, source, publisher, copyrholder, category, prodname, brand, series, platform, prognum, featnum, component, navtitle, searchtitle, abstract, body, section, example, prolog, metadata, linktext, linkinfo, conbody, prereq, context, cmd, info, tutorialinfo, stepxmp, choice, choptionhd, chdeschd, choption, chdesc, stepresult, result, postreq, refbody, refsyn, proptypehd, propvaluehd, propdeschd, proptype, propvalue, propdesc, glossterm, glossdef, uicontrol, screen, b, u, i, tt, sup, sub, codeph, codeblock, var, oper, delim, sep, pt, pd, fragref, repsep, msgph, msgblock, filepath, userinput, systemoutput, coords, index-see, index-see-also, index-sort-as
topic	data-about, data, title, shortdesc, desc, p, note, lq, q, sli, li, itemgroup, dthd, ddhd, dt, dd, fig, pre, lines, ph, alt, stentry, draft-comment, fn, indexterm, index-base, cite, xref, entry, author, source, publisher, copyrholder, category, prodname, brand, series, platform, prognum, featnum, component, navtitle, searchtitle, abstract, body, section, example, prolog, metadata, linktext, linkinfo, uicontrol, screen, b, u, i, tt, sup, sub, codeph, codeblock, var, oper, delim, sep, pt, pd, fragref, repsep, msgph, msgblock, filepath, userinput, systemoutput, coords, index-see, index-see-also, index-sort-as
task	data-about, data, title, shortdesc, desc, p, note, lq, q, sli, li, itemgroup, dthd, ddhd, dt, dd, fig, pre, lines, ph, alt, stentry, draft-comment, fn, indexterm, index-base, cite, xref, entry, author, source, publisher, copyrholder, category, prodname, brand, series, platform, prognum, featnum, component, navtitle, searchtitle, abstract, body, section, example, prolog, metadata, linktext, linkinfo, prereq, context, cmd, info, tutorialinfo, stepxmp, choice, choptionhd, chdeschd, choption, chdesc, stepresult, result, postreq, uicontrol, screen, b, u, i, tt, sup, sub,