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

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

@@ -0,0 +1,21 @@
+package net.minecraft.commands.tree;
+
+import net.minecraft.commands.arguments.CommandArgumentType;
+
+public class ArgumentCommandNode extends CommandNode {
+    private final String name;
+    private final CommandArgumentType type;
+
+    public ArgumentCommandNode(String name, CommandArgumentType type) {
+        this.name = name;
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public CommandArgumentType getType() {
+        return type;
+    }
+}

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);
+    }
+}

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

@@ -0,0 +1,13 @@
+package net.minecraft.commands.tree;
+
+public class LiteralCommandNode extends CommandNode {
+    private final String literal;
+
+    public LiteralCommandNode(String literal) {
+        this.literal = literal;
+    }
+
+    public String getLiteral() {
+        return literal;
+    }
+}

src/main/java/net/minecraft/commands/tree/package-info.java

@@ -0,0 +1,4 @@
+@ParametersAreNonnullByDefault
+package net.minecraft.commands.tree;
+
+import javax.annotation.ParametersAreNonnullByDefault;