From OpenCog

The StoreValueOfLink is a form of ValueOfLink that writes the indicated Value to storage. It then returns the current Value. It has the format:

   PredicateNode "some key"
   StorageNode "some://url"

On execution, it writes Value to the StorageNode, and then returns it just as ValueOfLink would.

Dual to this is FetchValueOf, which will fetch the Value from storage, and return that.

See also