namespace System.IdentityModel.Tokens { public abstract class SecurityToken { public abstract string Id { get; } public abstract ReadOnlyCollection<SecurityKey> SecurityKeys { get; } public abstract DateTime ValidFrom { get; } public abstract DateTime ValidTo { get; } public virtual bool CanCreateKeyIdentifierClause<T>() where T : SecurityKeyIdentifierClause; public virtual T CreateKeyIdentifierClause<T>() where T : SecurityKeyIdentifierClause; public virtual bool MatchesKeyIdentifierClause(SecurityKeyIdentifierClause keyIdentifierClause); public virtual SecurityKey ResolveKeyIdentifierClause(SecurityKeyIdentifierClause keyIdentifierClause); protected SecurityToken(); } }