diff --git a/src/common-structures.zig b/src/common-structures.zig
index 92cc9f8..7b8a32a 100644
--- a/src/common-structures.zig
+++ b/src/common-structures.zig
@@ -7,6 +7,10 @@ const HashMap = std.HashMap;
 const AutoHashMap = std.AutoHashMap;
 const ArrayList = std.ArrayList;
 
+fn say(tosay: []const u8) void {
+    std.debug.print("{}", .{tosay});
+}
+
 
 const PropertyHashMap = AutoHashMap([] const u8, PropertyValue);
 const NodeList        = ArrayList(Node);
@@ -19,6 +23,8 @@ pub const Node = struct {
     properties: PropertyHashMap,
     children:   NodeList,
 
+    gpa: *Allocator,
+
     pub fn deinit(self: *Node) void {
         self.properties.deinit();
         for (self.children.items) |k, v| {
@@ -27,6 +33,17 @@ pub const Node = struct {
         self.children.deinit();
     }
 
+    pub fn create(allocator: *Allocator, type_name: []const u8, id: ?[]const u8) !Node {
+         return Node{
+             .id = id,
+             .type_name = type_name,
+             .properties = PropertyHashMap.init(allocator),
+             .children = NodeList.init(allocator),
+             .gpa = allocator,
+         };
+    }
+
+
 };
 
 const PropertyValueTags = enum {
@@ -86,18 +103,27 @@ test "simple test about structures" {
 
 test "init a Root structure" {
     const allocator = std.heap.page_allocator;
+
+    say("\n");
+
+    say("creating a root\n");
     var root = try Root.create(allocator);
     defer root.deinit();
 
-    std.debug.print("\n", .{});
+    say("creating a definition and a few children\n");
+    try root.definitions.put("MyObject", try Node.create(allocator, "my-type-name", "my-id"));
+    try root.children.append(try Node.create(allocator, "object", "my-id"));
+    try root.children.append(try Node.create(allocator, "otherObject", null));
+    try root.children.append(try Node.create(allocator, "Text", "my-id-for-text-object"));
 
-    std.debug.print("root.definitions:\n", .{});
+
+    say("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", .{});
+    say("root.children:\n");
     for(root.children.items) |k, v| {
         std.debug.print("{} => {}:\n", .{k, v});
     }