Map group elements
The mapgroup domain elements represent particular containment
strategies within a set of topicrefs in a map.
The <topicgroup> element is for creating groups of <topicref> elements without affecting the hierarchy, as opposed to nested <topicref> elements within a <topicref>, which does imply a structural hierarchy. It is typically used outside a hierarchy to identify groups for linking without affecting the resulting toc/navigation output.
The <topichead> element provides a title-only entry in a navigation map, as an alternative to the fully-linked title provided by the <topicref> element.
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OASIS DITA Version 1.1 Language Specification -- OASIS Standard, 1 August 2007
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