<onto_stats>
   <num_concepts>10</num_concepts>
   <max_level>3</max_level>
   <num_leaf_concepts>7</num_leaf_concepts>
   <num_instances>527</num_instances>
   <max_num_instances_per_leaf_concept>237</max_num_instances_per_leaf_concept>
   <min_num_instances_per_leaf_concept>12</min_num_instances_per_leaf_concept>
   <max_num_immediate_children>4</max_num_immediate_children>
   <min_num_immediate_children>0</min_num_immediate_children>
</onto_stats>