anchor.diff:  * nation{1}
   * total production{1}
   * scan radius{1}
  +* (selected) ship type{0..1}
  +
  +| total production
  +| Planetary production is measured in BCs (billions of credits) and is a measure of a solar system’s overall production capacity.
  +| -
  +| -
  +
  +| scan radius
  +| The area colonies and fleets are able to scan for foreign colonies and fleets. It is measured in parsecs.
  +| -
  +| -
   
   | fleet
   | A group of ships commanded by a nation. Is either orbiting a star or traveling through deep space. 
   | - 
   |
   * nation{1}
  -* ship{+}
  +* ship type --> count{+}
   * star{0..1}
   
  -| ship
  -| A single space vessel. The type is either:
  +| ship type
  +| Type of a single space vessel. The speed is given in parsecs per turn. The type is either:
   
  -* scout (speed = 0.5, scan radius = 0.5)
  -* fighter (speed = 0.4, scan radius = 0.25)
  -* colony ship (speed = 0.25, scan radius = 0.5)
  +* scout (speed = 0.5, scan radius = 0.5, costs = 10)
  +* fighter (speed = 0.4, scan radius = 0.25, costs = 20)
  +* bomber (speed = 0.3, scan radius = 0.15, costs = 40)
  +* colony ship (speed = 0.25, scan radius = 0.5, costs = 80)
   | -
   |
  -* type
  +* (speed)
   * scan radius{1}
  -* speed [parsecs/turn]
  +* (costs)
   
   |=== 
  
positive.code: | -
  | -
  
  | special
  | Mineral Poor, Ultra Poor, Artifact, Mineral Rich, Ultra Rich, Hostile, Fertile, Gaia
  | -
  | -
  
negative.code: [cols="a,a,a,a",width="100%"]
  |===
  | Term | Description | Supertype (is-a) | Relations (has-a)
  