Facsimile (Mondrian)
The facsimile is encoded as described under Facsimile.
Sheets have two surfaces, front and back, or in technical terms: recto and verso. The surfaces on the first sheet are called 1r (1 recto) and 1v (1 verso), on the second sheet 2r and 2v, etc. If the sheet has been folded once, we have four zones: 1r-1, 1v-2,1v-3,1r-4. If there is no need to distinguish different zones on the sheet (surface is used as a single zone), we don't define zones for that sheet.
Envelopes, if available, also have a front and back side, which we identify by er and ev.
We associate graphics with the surfaces and zones preferably by referring to an RKD barcode. The details still have to be worked out. We probably will not include graphics directly within the zone but will refer to the image of the surface and define the size and locatiuon of the zone in terms of the surfaces coordinate system.
