This diagram illustrates an example ADF hierarchical database, with parent and child nodes, node IDs, and links. The database consists of two files - ADF_File_One and ADF_File_Two.
At the top in the file ADF_File_One is the Root node. At the first level below the Root node are three child nodes (i.e., sub-nodes), with IDs N1, N2, and N3.
N1 has the following three children at the next lower level.
The second node at the first level below the Root node, N2, has no children.
The third node just below the Root node, N3, has the following three children at the next lower level.
In the file ADF_File_Two, there is again a Root node at the top level, with children F1, F2, and F3. F1 and F2 have no child nodes, while F3 has children F4 and F5.
The link nodes L1, L2, and L3 in the file ADF_File_One point to other nodes in the ADF database. L1 and L2 are both links to the node N13 in the same file, ADF_File_One. L3 is a link to the node F3 in the file ADF_File_Two.