Once we have T174031: MCR: Include all slots in XML dumps, we need to also be able to read/import slots other than the main slot from dumps. This means implementing support for XML schema version 0.11 in WikiImporter. To enable this, we'll probably want to turn WikiRevision into a wrapper for MutableRevisionRecord.
From other tickets i gather that there was an agreement for a format that would contain all slots, seems like this one was version 0.11 https://www.mediawiki.org/wiki/Requests_for_comment/Schema_update_for_multiple_content_objects_per_revision_(MCR)_in_XML_dumps#Schema
But the version of the current dumps on commons are version="0.10" so, are there any dumps that include the slots that in turn include the structure data?