Updated RelayNode;

Added ISlot interface;
Added ProxySlot;

Runtime/Attributes/ISlot.cs

@@ -0,0 +1,52 @@
+using System.Collections.Generic;
+
+namespace Misaki.GraphView
+{
+    public interface ISlot
+    {
+        public SlotData SlotData
+        {
+            get;
+        }
+
+        public List<SlotData> LinkedSlotDatas
+        {
+            get;
+        }
+
+        public bool IsLinked
+        {
+            get;
+        }
+
+        public DataNode Owner
+        {
+            get;
+        }
+
+        public object Data
+        {
+            get;
+        }
+
+        /// <summary>
+        /// Link the current slot with another slot.
+        /// </summary>
+        /// <param name="other"> <see cref="ISlot"/> The slot need to be linked </param>
+        /// <param name="connection"> <see cref="SlotConnection"/> The connection that created when link </param>
+        /// <returns> True if the link action is succeed, otherwise false </returns>
+        public bool Link(ISlot other, out SlotConnection connection);
+
+        /// <summary>
+        /// Unlink the current slot with another slot.W
+        /// </summary>
+        /// <param name="other"> <see cref="ISlot"/> The slot need to be unlinked </param>
+        public void Unlink(ISlot other);
+
+        /// <summary>
+        /// Send data to the slot.
+        /// </summary>
+        /// <param name="data"> The data want to send </param>
+        public void ReceiveData(object data);
+    }
+}

Runtime/Attributes/ISlot.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 33754a5a556e98d468f1bb3aef689de6