I just pushed new stuff to be able to export attachment revision in a streamed fashion when using XAR format.
For this in introduced the following things:
- new events in in WikiAttachmentFilter to expose streamed attachment revisions and deduplication to all filters
- support for those new events in Instance input/output filters and XAR input/output filters
- new specification in the XAR format to support those events
@mflorea is going to integrate this in the admin export UI (i.e. being able to choose which format to use)
Would be great if you could take a quick long before 12.0 and tall me if you notice something wrong (especially with the naming).