Separating Expression & statement

src/statement/World.java

@@ -0,0 +1,19 @@
+package statement;
+
+import expression.Node;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+/**
+ * Created by xawirses on 29/03/17.
+ */
+public class World {
+    private String name;
+    private Collection<Node> expressions = new ArrayList<>();
+    private Collection<World> involved = new ArrayList<>();
+
+    public World(String name) {
+        this.name = name;
+    }
+}