In some WikiEngine''''''s that support SectionEditing, you can edit a part of the page, not the whole part of the page. This feature is useful in editing structured documents. MediaWiki supports this.

It may be useful in DocumentMode, ListMode or FaqMode.
It may not be useful in ThreadMode.

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WikiEngine''''''s supporting SectionEditing
*MediaWiki
*DokuWiki
*OddMuse (via this extension: http://www.oddmuse.org/cgi-bin/wiki/EditSection_Module)

WikiEngine''''''s NOT supporting SectionEditing, but supporting alternating features related to sections
*UseModWiki support SubPage
*PurpleWiki support TransClusion

See also: WikisWithCommentAppending, SectionEditing, ParagraphWiki
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CategoryWiki CategoryWikiImplementation CategoryWikiFeature