The <topic> element is the top-level DITA element for a single-subject topic or article. Other top-level DITA elements that are more content-specific are <concept>, <task>, <reference>, and <glossentry>, all of which are specializations of the <topic> element.
|topic, concept, glossary, glossentry, glossgroup, reference, task, machineryTask, learningAssessment, learningOverview, learningPlan, learningSummary||( (title) then (titlealts) (optional) then (shortdesc or abstract) (optional) then (prolog) (optional) then (body) (optional) then (related-links) (optional) then (topic) (any number) )|
|ditabase||( (title) then (titlealts) (optional) then (shortdesc or abstract) (optional) then (prolog) (optional) then (body) (optional) then (related-links) (optional) then (topic or concept or task or reference or glossentry or glossgroup) (any number) )|
|learningContent||( (title) then (titlealts) (optional) then (shortdesc or abstract) (optional) then (prolog) (optional) then (body) (optional) then (related-links) (optional) then ( (no-topic-nesting) (optional) ) (any number) )|
|topic (base), topic (technical content), concept, reference, task (strict), task (general), machineryTask||topic|
|ditabase||dita, topic, concept, task, reference|
|glossary, glossentry, glossgroup||topic, concept|
|learningAssessment, learningOverview, learningPlan, learningSummary||topic, learningBase|
<topic id="topic"> <title>Some little topic</title> <body> <p>Here's a little topic.</p> <ul> <li>Some item</li> <li>Another item</li> </ul> </body> </topic>
|Name||Description||Data Type||Default Value||Required?|
|id||This ID enables topics to be referenced uniquely by topicrefs in DITA maps.||ID||Yes|
|conref-atts attribute group (conref, conrefend, conaction, conkeyref)||A set of related attributes; includes all of the attributes described in id-atts attribute group except for the id attribute.|
|xmlns:ditaarch||Declares the default DITA namespace.||"http://dita.oasis-open.org/architecture/2005/"|
|DITAArchVersion||Designates the version of the architecture that is in use. The default value will increase with each release of DITA.||CDATA||"1.2"||No|
|domains||Indicates the specialized domains that are included in the DTD or Schema. This value will differ depending on what domains are included in the current DTD or Schema.||CDATA||Varies based on the DTD or Schema; a sample value is "(topic ui-d) (topic hi-d) (topic pr-d) (topic sw-d) (topic ut-d) (topic indexing-d)"||No|
|select-atts attribute group (props, base, platform, product, audience, otherprops, importance, rev, status)||A set of related attributes, described in select-atts attribute group|
|localization-atts attribute group (translate, xml:lang, dir)||A set of related attributes, described in localization-atts attribute group.|
|global-atts attribute group (xtrf, xtrc)||A set of related attributes, described in global-atts attribute group|
|class, outputclass||Common attributes described in Other common DITA attributes|
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OASIS DITA Version 1.2 -- OASIS Standard, 1 December 2010
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