<onto_stats>
   <num_concepts>167</num_concepts>
   <max_level>4</max_level>
   <num_leaf_concepts>141</num_leaf_concepts>
   <num_instances>6957</num_instances>
   <max_num_instances_per_leaf_concept>214</max_num_instances_per_leaf_concept>
   <min_num_instances_per_leaf_concept>5</min_num_instances_per_leaf_concept>
   <max_num_immediate_children>49</max_num_immediate_children>
   <min_num_immediate_children>0</min_num_immediate_children>
</onto_stats>