First approach

src/alire.ads

@@ -0,0 +1,50 @@
+limited with Alire.Repositories;
+
+with Semantic_Versioning;
+
+package Alire with Preelaborate is        
+   
+   type Project (<>) is private;
+   --  A name + Storage location
+   
+   type Project_Name is new String;
+   
+   function New_Project (Name : Project_Name; 
+                         Repo : Repositories.Repository'Class) return Project;
+   
+   
+   
+   type Release (<>) is private;
+   
+   function New_Release (Prj     : Project; 
+                         Version : Semantic_Versioning.Version;
+                         Commit  : Repositories.Commit_ID) return Release;
+      
+
+   
+   type Dependency (<>) is private;   
+   
+   type Dependencies (<>) is private;
+   
+   Nothing : constant Dependencies;
+   
+   function New_Dependency (Name : Project_Name; Versions : Semantic_Versioning.Version_Set) return Dependency;
+   
+   function "and" (Dep1, Dep2 : Dependency)               return Dependencies;
+   function "and" (Deps : Dependencies; Dep : Dependency) return Dependencies;                  
+   
+private      
+   
+   type Dependency is null record;
+   
+   type Dependencies is null record;
+   
+   Nothing : constant Dependencies := (null record);
+   
+   type Project is null record;
+   
+   type Release is null record;
+   
+   type Release_Set is null record;
+   
+end Alire;