Re: [YANG] import statement

[Ladislav Lhotka <lhotka at cesnet.cz>]

Martin Bjorklund píše v So 03. 05. 2008 v 22:24 +0200:
> > Then augment performs two fundamentally different things  
> 
> I don't agree.  Why?
> 

With the absolute argument, augment inserts something carrying its own
namespace in between foreign namespace nodes. In particular, no name
conflicts can ever happen.

With uses and the descendant form of augment, you are first adopting
something to your namespace and then modifying it. Names can clash here.
For example, the author of the imported module may add an optional node
to a grouping that from his point of view is perfectly backward
compatible change. This may however break the importing module if a node
added by augment happens to have the same name and is added at the same
place.

The syntax

  uses foo:bar {
    augment baz {
     ...
    }
  }
  uses boo:hoo;

has at least the advantage that it doesn't matter if boo:hoo uses baz.

Lada

-- 
Ladislav Lhotka, CESNET
PGP Key ID: E74E8C0C

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