Add ACL interface

python/README.md

@@ -47,6 +47,27 @@ in CIC native interfaces.
 
 ## Native interfaces
 
+### ACL
+
+A simple Access Control List definition that returns true of false
+depending on whether an signatory (address) is allowed to operate in a
+given context.
+
+#### ERC165 Interface identifier
+
+3ef25013
+
+#### Solidity interface definition
+
+    interface IACL {
+        // Returns true if the address has permission to operate in the given context.
+        function have(address _address) external view returns(bool);
+    }
+
+#### Example implementation
+
+<git://holbrook.no/eth-accounts-index.git>
+
 ### Accounts Index
 
 Append-only list of addresses. Typically used for access control lists.
@@ -83,6 +104,7 @@ b7bca625
         function add(address) external returns (bool);
 
         // Verify that the entry exists in the index.
+        // Implements ACL
         function have(address) external view returns (bool);
 
         // Retrieve the timestamp when account was added.