namespace System.ComponentModel.Design.Serialization { public abstract class MemberRelationshipService { public MemberRelationship this[MemberRelationship source] { get; set; } public MemberRelationship this[object sourceOwner, MemberDescriptor sourceMember] { get; set; } protected MemberRelationshipService(); protected virtual MemberRelationship GetRelationship(MemberRelationship source); protected virtual void SetRelationship(MemberRelationship source, MemberRelationship relationship); public abstract bool SupportsRelationship(MemberRelationship source, MemberRelationship relationship); } }