[Nml-wg] New version of the schema document

[John Vollbrecht]

My mind was tricked into saying level instead of layer ins some places  
-  I fix them below.  Sorry.

John

On Aug 24, 2009, at 4:15 PM, John Vollbrecht wrote:

> I have some comments on the schema -  I talked a bit with Jeroen  
> about these since he is in AA this month.  I like the schema and  
> that it is defining things so they can be discussed.  I particularly  
> like the definition of adaptation as being between ports at  
> different layers - this explains it for me and implies that  
> adaptation takes place between ports at different layers of the same  
> device.
>
> I have other comments -
>
> 1) Jeroen says that there will be an introduction, and that it will  
> define network- I just mention this.
> 2) I think that  level
/ layer/
> should be a top level element.  I think the reason it isn't there is  
> that there was some confusion about whether the initial schema would  
> be single or multiple level.
/ayer/
> 3) Subnet - the concept from G.800, 805 and 8080 should be  
> included.  Perhaps as a top level element or as a special group - I  
> am not sure.
> 4) Ports should have relationship with groups, especially with  
> subnetworks.  They also have relationship with layer.
> 5) I think that there could be virtual ports similar to virtual  
> nodes, so an implemented by relation would be appropriate.  Jeroen  
> may write this up more, but 8080 show virtual ports (SNPPs) and IDCs  
> implement multiple next hops using VLAN groups on some edge ports.
>
> some smaller points -
> 6) I think link capacity should not be the only attribute in the  
> schema.  Perhaps something like "A Link MAY have additional  
> attributes describing the performance, ownership, policy".   A  
> separate sentence might say that attributes that describe throughput  
> MUST be in bytes per second rather than bits per second.
>
> 7) Link definition seems circular when describing it as a link :)
>
> John
>
>
> On Aug 21, 2009, at 3:55 PM, Jeroen van der Ham wrote:
>
>> Hello,
>>
>> I've just submitted a new revision of the schema document to the  
>> subversion repository. Here's the changelog:
>>
>> - Added a short description of the Location and Lifetime objects
>> - Added a section enumerating all Relations. I've not called them  
>> "Relations" throughout the text.
>> If need be, we can always make the names of Relations implicit in  
>> the syntax.
>> - Added a section on Service, describing the way we currently see  
>> adaptations? I welcome comments!
>> - The group section probably needs more work.
>>
>> I've updated the UML schema diagram to the latest version. I've  
>> also added a note saying that this is not intended as endorsement  
>> or finalizing, merely trying to reflect the current status.
>>
>> - Changed the Link group to Bidirectional Link as per the diagram.
>>
>>
>> The latest version of the PDF can be found in the subversion  
>> repository. Unfortunately the web access to it seems broken at the  
>> moment, so I'm attaching it to this mail.
>>
>> Jeroen.
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>