package org.simantics.spreadsheet.graph;
+import java.io.Serializable;
import java.util.Map;
-public interface SheetNode<Child extends SheetNode<?, ?>, Property extends SheetNode<?, ?>> {
+public interface SheetNode<Child extends SheetNode<?, ?>, Property extends SheetNode<?, ?>> extends Serializable {
String getName();
Map<String, Child> getChildren();