Build stuff into nodes! They may not do anything, but it's node-tastic!

src/main/java/net/minecraft/commands/tree/CommandNode.java

@@ -0,0 +1,17 @@
+package net.minecraft.commands.tree;
+
+import com.google.common.collect.Lists;
+
+import java.util.List;
+
+public abstract class CommandNode {
+    private final List<CommandNode> children = Lists.newArrayList();
+
+    public List<CommandNode> getChildren() {
+        return children;
+    }
+
+    public void addChild(CommandNode node) {
+        children.add(node);
+    }
+}