"Yea you can store them in a dictionary if needed. I actually first built this library to move a ton of hierarchical content from a legacy CMS to WP. I ended up building a recursive function that handled it nicely. My recursive function had a parameter called parentId that defaults to 0 (if you set it to 0 WordPress knows it's a top level page). So the function just set it every time and would pass the parent id in from the parent page as it recursed. Worked well." - andy brudtkuhl