Protocols
The following protocols are available globally.
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                  The See moreRuleprotocol declares the required methods for all objects that subscribe to it.DeclarationSwift public protocol Rule
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                  Protocol for See moreValidationDelegateadherents, which comes with two required methods that are called depending on whether validation succeeded or failed.DeclarationSwift @objc public protocol ValidationDelegate
 Protocols  Reference
        Protocols  Reference