<td align="left">center / hub</td><td align="left">set to center if it is a cetner, or hub if it is a hub</td></tr><tr class="even"><td align="left">name</td><td align="left">yes</td><td align="left"></td><td align="left">give a meaningful name for this center or hub. It's just a name easy-to-read so no need to be universally unique</td></tr><tr class="odd"><td align="left">id</td><td align="left">yes</td><td align="left"></td><td align="left">this should be universally unique as it refers to this center or