The required resources are defined here. A required resource can be defined in a flexible manner such that if a field is supplied a value that value is used if not a generic definition is considered. For instance, if airport is explicitly chosen, then the required resource is for that airport only; if not, it is considered as defined for all of the operational airports.
The required resources can be defined specifying the landed airport, airline, aircraft type, transit or not transit flag, domestic/international, equipment/manpower, the resource code, flight load type (passenger, cargo, combi, baggage flight or ferry), flight type (transportation, military, general aviation), scheduled/charter and the necessary timing definitions which include whether this resource is for arrival, departure or both, resource amount, when and how long that resource will be needed.