The retrieval will begin with the querying technique. The transformational and fusion operators can be used for this purpose. A transformational operator is applied to any multi-dimensional source of objects in a specified set of intervals along a dimension. The generalized form of a transformational operator is for locating an object in a time period t1 to t2 from a source will be:

Stype (object name) Sxyz(*)
S (T) T > t1 and T < t2
Smedia_sources(source name) media_sources