Used to define the identifier constants that you can pass to the correlationType(forIdentifier:) method to create HKCorrelationType instances. For a list of valid identifiers, see Correlation Identifiers in HealthKit Constants.
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static let bloodPressure: HKCorrelationTypeIdentifier
Blood pressure correlation types combine a systolic sample and a diastolic sample into a single blood pressure reading.
static let food: HKCorrelationTypeIdentifier
Food correlation types combine any number of nutritional samples into a single food object. Ideally, the food object should also specify the type of food it represents using the HKMetadataKeyFoodType metadata key.