Rich Morin schrieb:
...
img_name is the primary key for the table, so using
SQL to find a page's
neighbors by sort order should be relatively inexpensive.
...
I now found out, that there are plans for a completely different
solution (see [[s:en:User:Tim_Starling/ScanSet_PNG_demo]]), but thank
you very much for the answer.
Jofi