[Nsi-wg] Topology Representation Schema

[Jeroen van der Ham]

Hi,

Here's a first attempt at an XML version of the topology description.

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On 24 May 2013, at 15:13, Henrik Thostrup Jensen <htj at nordu.net> wrote:
>> Please let me know what you think.
> 
> 3.1.1
> 
> This section leaves out the cs[2]ProviderEndPoint which we have previously used. However I think that the service class makes much more sense.

I believe we agreed in Charlottesville that we would go for the Services class to be in line with the Discovery Service description of services.

> 
> 3.1.2 + 3.3
> 
> The term "link" is an odd choice IMHO. The common term for this is "url", or occasionally "endpoint" (main used with web services). I think the term "link" is particularly unfortunate as it occurs in describing network topology, where this word typically has another meaning.

This is in line with the Discovery Service, and I think John took this from other recommendations or implementations.

> 
> 5.
> 
> The main reason we decided on a single format in Charlottesville, was so implementations would know exactly what that must be exported and must be able to parse. Hence I think that the "SHOULD" for parsing OWL syntax should be relaxed to "MAY" or "OPTIONAL".
> 
> The OWL example includes nsi:cs2ProviderEndpoint despite not being specified in the document. I think it can just be removed.
> 
> Should nml:Topology in the top be a nml:Node? I am left a bit puzzled about when to use topology and node now. Same with Port and PortGroup (I'll admit to now having read the full nml spec).

A Topology describes a network domain, and it can act like a Node. Theoretically, there is no difference between a Node and a Topology. Practically it's often easier to be able to differentiate between them.

Jeroen.