diff --git a/src/common-structures.zig b/src/common-structures.zig
index c894ce4..92cc9f8 100644
--- a/src/common-structures.zig
+++ b/src/common-structures.zig
@@ -18,6 +18,15 @@ pub const Node = struct {
     type_name:  [] const u8,
     properties: PropertyHashMap,
     children:   NodeList,
+
+    pub fn deinit(self: *Node) void {
+        self.properties.deinit();
+        for (self.children.items) |k, v| {
+            v.deinit();
+        }
+        self.children.deinit();
+    }
+
 };
 
 const PropertyValueTags = enum {
@@ -38,6 +47,24 @@ pub const PropertyValue = union(PropertyValueTags) {
 pub const Root = struct {
     definitions: Definitions,
     children:    NodeList,
+
+    gpa: *Allocator,
+
+    pub fn create(allocator: *Allocator) !Root {
+         return Root{
+             .definitions = Definitions.init(allocator),
+             .children = NodeList.init(allocator),
+             .gpa = allocator,
+         };
+    }
+
+    pub fn deinit(self: *Root) void {
+        self.definitions.deinit();
+//        for (self.children.items) |k, v| {
+//            k.deinit();
+//        }
+        self.children.deinit();
+    }
 };
 
 test "simple test about structures" {
@@ -57,3 +84,22 @@ test "simple test about structures" {
 }
 
 
+test "init a Root structure" {
+    const allocator = std.heap.page_allocator;
+    var root = try Root.create(allocator);
+    defer root.deinit();
+
+    std.debug.print("\n", .{});
+
+    std.debug.print("root.definitions:\n", .{});
+    var it = root.definitions.iterator();
+    while(it.next()) |kv| {
+        std.debug.print("{} => {}:\n", .{kv.key, root.definitions.get(kv.key)});
+    }
+
+    std.debug.print("root.children:\n", .{});
+    for(root.children.items) |k, v| {
+        std.debug.print("{} => {}:\n", .{k, v});
+    }
+}
+