Hi devs, In order to fix https://jira.xwiki.org/browse/XWIKI-8180 Extension Manager XAR handler need to access some way a mandatory document as it should be when it's "clean" so that It can then be used as previous version in a 3 ways merge. For that the idea is to introduce a new component based mandatory documents initialization and refactor XWiki#initializeMandatoryClasses to use it. This new MandatoryDocumentInitializer would allow: * provide a new mandatory document initializer from an extension since XWiki#initializeMandatoryClasses would lookup all of them * find a clean mandatory document state for a given document reference in extension manager XAR handler since that's the role hint of those components You can find an example of what a XWikiPreferencesDocumentInitializer would look like in https://github.com/xwiki/xwiki-platform/tree/feature-standardclasses branch. WDYT ? -- Thomas Mortagne