The terminal page status of a page isn’t saved in any XObject but is simply a consequence of the page name: Document references like A.B.C that end in the “name” of the page are terminal pages, document references ending in .WebHome like A.B.C.WebHome are non-terminal pages. So when creating new pages, you need to make sure that your document references end in .WebHome. If you know the role of index.html on a web server, the WebHome name basically has the same role in XWiki.
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