See CMS-13523/CMS-13432
In there we added support for xpages layouts in hst config. For PaaS, it is only supported below hst:configuration and not below hst:workspace
For SaaS, it should not have a separate 'hst:xpages' section, but just between normal pages (just like abstract pages)
CMS-13432 Support available XPage templates via Hst Model
CMS-13523 Only store the XPage container items below a document variant
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