Re: [YANG] import statement

[Andy Bierman <ietf at andybierman.com>]

Ladislav Lhotka wrote:
> Juergen Schoenwaelder píše v So 03. 05. 2008 v 18:58 +0200:
>> On Sat, May 03, 2008 at 05:31:03PM +0200, Ladislav Lhotka wrote:
>>> Juergen Schoenwaelder p????e v So 03. 05. 2008 v 16:32 +0200:
>>>
>>>> There are also examples. An augment of foo-cont simply sticks nodes
>>>> into the foo-cont container; there is no new instantiation of
>>>> foo-cont.
>>>>
>>> Example on pages 82 and 83 contradicts what you are saying: the augment
>>> statement in namespace http://example.com/schema/ds0 takes the schema
>>> subtree defined by "container interfaces" in namespace
>>> http://example.com/schema/interfaces, augments it and effectively places
>>> the result at the spot of the augment statement in the
>>> http://example.com/schema/ds0 namespace.
>> I don't see the contradiction.
>>
>>      augment "/if:interfaces/if:ifEntry" {
>>          when "if:ifType='ds0'";
>>          leaf ds0ChannelNumber {
>>              type ChannelNumber;
>>          }
>>      }
>>
>> This augment introduces a leaf ds0:ds0ChannelNumber that appears under
>> /if:interfaces/if:ifEntry and this is what the example shows. There
>> is no new instantiation of /if:interfaces/if:ifEntry.
> 
> Assume a device that supports the data model as in the XML snippet on
> page 83. Which of the two namespace URIs will it advertise in the hello
> message? 


Both namespaces.
Maybe it is easier to visualize in XML (NETCONF edit-config PDU):

<rpc message-id="101"
   xmlns="netconf-base-URI"
   xmlns:nc="netconf-base-URI"
   xmlns:if="IF-MIB-URI"
   xmlns:ds0="DS0-MIB-URI">
  <edit-config>
   <target><running/></target>
   <default-operation>none</default-operation>
   <test-option>test-then-set</test-option>
   <error-option>rollback-on-error</error-option>
   <config>
     <if:interfaces>
       <if:ifEntry>
         <if:ifIndex>17</if:ifIndex>
         <ds0:ds0ChannelNumber nc:operation="replace">
           1
         </ds0:ds0ChannelNumber>
       </if:ifEntry>
     </if:interfaces>
   </config>
  </edit-config>
</rpc>


I assume it is http://example.com/schema/ds0. Where is the
> <interfaces> block then instantiated if the import statement just makes
> the identifiers from http://example.com/schema/interfaces accessible and
> the augment statement doesn't do it?
> 
> Lada
> 
>> /js
>>

Andy

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