• query language with spatial/temporal/data operators

• sketch-based similarity retrieval  (user-specified threshold)

Wider range of operators than for static image retrieval:

• extract information from within scenes (tracks, st-rels, ...)

• select scenes based on exact/inexact criteria (predicates)

• construct new scenes (filter/combine existing scenes)

Use OO notation for operators: Obj.Operator(Args)

For relevant operations, if Obj is a set (list) of objects, then Operator is applied to each element in the set.