#PO_Box_No__post-office_box_No__post-office_box_number__PO_box_number  the number of a letter box at the post office where mail is collected
  supertype:  pm#integer_address_part__integeraddresspart (pm)
  part of:  #mailing_address
  subtype:  pm#region_PO_Box_No
  subtype:  pm#GPO/PMB_Box_No

1 statement is about an indirect instance of #PO_Box_No (pm#region_PO_Box_No): pm#graph1_on_address
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