### Conditions

Logical conditions, describing when an object/event can be activated.

#### Format:

    <cond check="is">
      <type>...</type>
      <param>...</param>
    </cond>

Attributes:

- `check` - when the related object will be enabled? Available values:
  - `is` (default) - the condition is fulfilled.
  - `isnt` - the condition is not fulfilled.
  - `once` - the condition was fulfilled.
  - `never` - the condition wasn't fulfilled.

Parameters:

- `type` - condition type. Available values:
  - `none` - empty condition. Parameter: none.
  - `clear` - all physicals of given type were wiped out. Parameter: filter name (string).
  - `time-elapsed` - given amount of time elapsed after the map had been loaded. Parameter: time (float, [s]).
  - `region-triggered` - somebody walked into a given region. Parameter: region name (string).
  - `killed` - named physical is dead and his corpse is still on the map. Parameter: physical name (string).
- `param` - depends on `type` parameter.