This kind of element specifies various features of items that can be picked up. These are specified with the child element <item>, which has these attributes:

• index (mandatory)
• singular: index of singular name string (only one of them)
• plural: index of plural name string (more than one of them)
• maximum: maximum number that a player may possess
• invalid: what environments the item cannot be used in; this value is determined by the sum of values for individual environment types:
  •     0 (hex 0000) Normal
  •     1 (hex 0001) Vacuum
  •     2 (hex 0002) Magnetic
  •     4 (hex 0004) Rebellion
  •     8 (hex 0008) Low Gravity
  •  8192 (hex 2000) Network
  • 16384 (hex 4000) Single Player