3. The method of claim 2 , wherein creating the first database table comprises: creating a row for each node contained in the logical tree structure, each row containing a field entry for at least: (i) the node type of the respective; (ii) an identifier of the respective node; and (iii) left and right indicators used to delineate nested set hierarchy notation between nodes corresponding to different rows in the first database table.
4. The method of claim 3 , wherein a combination of the node type and the identifier forms a unique identifier of the respective node.