diff --git a/src/alire-origins.ads b/src/alire-origins.ads
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+package Alire.Origins is
+
+   --  Minimal information about origins of sources.
+   --  We use the term origins to avoid mixing 'alire sources' with 'project sources' or other 'sources'.
+
+   --  The actual capabilities for check-outs or fetches are in alr proper
+
+   type Kinds is (Apt, Git, Hg, HTTP, RPM);
+   --  Only Apt-installed and Git remotes supported, for now
+
+   type Origin (Kind : Kinds) is tagged private;
+
+   function New_Origin (Kind : Kinds;
+                        URL  : Alire.URL;  -- A locator for the resource/server/entity containing the sources
+                        ID   : String)     -- A unique identifier within the server (commit id, zipfile, package name...)
+                        return Origin;
+   --  This should be general enough for all foreseeable sources.
+
+   function URL (This : Origin) return String;
+
+end Alire.Origins;