pm#numeric_attribute__numericattribute
  supertype:  attribute_or_quality_or_measure  e.g., mass, mass unit, 1 kg, frequency, [2-3] hz, color, blue, speed, 1 m/s
  subtype:  latitude
  subtype:  longitude
  subtype:  ID_number
     subtype:  integer_address_part__integeraddresspart
        subtype:  street_No
        subtype:  floor_No
        subtype:  unit_No
        subtype:  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
           subtype:  region_PO_Box_No
           subtype:  GPO/PMB_Box_No
     subtype:  City_Search_ID
  subtype:  star_rating
  subtype:  minimum_number_of_nights

1 statement is about an indirect instance of numeric_attribute (region_PO_Box_No): graph1_on_address
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