1. A computer implemented method, for use in a computer-based data processing and storage system, for obtaining a view of a database or a subset of a database, comprising the steps of: storing references to data items or to groups of data items in data access nodes; storing references to other data access nodes thus arranging a first access structure of data access nodes, wherein a first access node is directly or indirectly linked to a second access node or to a data item referred to by a reference of said second node; and initiating a view of said database or said subset of said database by either rearranging one or more of said references to other data access nodes so as to arrange a second access structure of data access nodes or by retrieving references pointing at said data items of a selectable aspect, kind, or class.