Add initial prototype.

2-low/collada/source/collada-document.ads

@@ -0,0 +1,28 @@
+with
+     collada.Asset,
+     collada.Libraries;
+
+package collada.Document
+--
+-- Models a colada document.
+--
+is
+   type Item is tagged private;
+
+   function to_Document (Filename : in String) return Item;
+
+
+   function Asset     (Self : in Item) return collada.Asset    .item;
+   function Libraries (Self : in Item) return collada.Libraries.item;
+
+
+
+private
+
+   type Item is tagged
+      record
+         Asset     : collada.Asset    .item;
+         Libraries : collada.Libraries.item;
+      end record;
+
+end collada.Document;