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.


Note: These models represent only the default document types distributed by OASIS. Actual content models will differ with each new document type.
Doctype Content model
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) )

Contained by

Doctype Content model
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
learningContent learningBase, learningContent


- topic/topic


<topic id="topic">
 <title>Some little topic</title>
  <p>Here's a little topic.</p>
   <li>Some item</li>
   <li>Another item</li>


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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