THPDFJobProcessor.ExecuteOperation
Executes one parsed operation object and returns its result object
class function ExecuteOperation(Op: THPDFJSONValue): THPDFJSONValue; static;
The unit is HPDFDocJobs; the operation kind is read from the object's type member and dispatched to the matching implementation
The caller owns the passed operation and the returned result value
Use Execute for whole job documents and ExecuteLoadedOperation when a loaded document is already at hand