requirementType

Name	Type	Use	Description
`@externalDataDirectory`	`xsd:string`	optional	Directory of the external data file
`@externalDataNodePath`	`xsd:string`	optional	Path of the node inside the external data file
`@externalFileName`	`xsd:string`	optional	Name of the external data file

Name	Type	OccurrenceHow often the element may appear at this place. The schema writes it as minOccurs and maxOccurs on the declaration.	Description
allThe children below may appear in any order. Each may appear at most once.
`required`	`doubleBaseType`	[1..1] required	Required value
`actual`	`doubleBaseType`	[0..1] optional	Actual value achieved

Used by

Type	Name
`aircraftGlobalType`	`designRange`
`airportCompatibilityGlobalType`	`landingFieldLength`
`airportCompatibilityGlobalType`	`runwayLoading`
`airportCompatibilityGlobalType`	`takeOffFieldLength`
`airportCompatibilityGlobalType`	`wheelTrackWidth`
`airportCompatibilityGlobalType`	`wingSpan`
`payloadGlobalType`	`cargoCapacity`
`payloadGlobalType`	`paxSeats`
`performanceTargetsGlobalType`	`approachSpeed`
`performanceTargetsGlobalType`	`cruiseMach`
`performanceTargetsGlobalType`	`initialCruiseAltitude`
`performanceTargetsGlobalType`	`maxOperatingAltitude`
`performanceTargetsGlobalType`	`maximumOperatingMach`
`performanceTargetsGlobalType`	`maximumOperatingVelocity`
`performanceTargetsGlobalType`	`timeToClimb`