On Thu, Apr 16, 2015 at 09:15:47AM +0200, Juergen Schoenwaelder wrote:
> On Thu, Apr 16, 2015 at 09:02:32AM +0200, Martin Bjorklund wrote:
> > Juergen Schoenwaelder <[email protected]> wrote:
> > > I think some thought should also be given to simplify the references.
> > > Right now, in order to refer to a termination point, I have to use a
> > > triple (network-ref, node-ref, tp-ref). Have you considered using an
> > > instance-identifier with require-instance instead? One option would be
> > > to define proper typedefs such as
> > >
> > > typedef tp-ref {
> > > type instance-identifier { require-instance }
> > > description
> > > "An instance identifier refering to a termination point."
> > > }
> > >
> > > and then things can be collapsed. One would likely do the same for
> > > other model elements, that is introduce typdefs for node-ref, link-ref
> > > network-ref. This will make the tree much more compact.
> >
> > There are two drawbacks with this scheme. First, the model is less
> > precise. An instance-identifier can refer to anything, and there is
> > not formal constraint in the model to restrict it to a termination
> > point.
>
> Hence you wrap it in a typedef with an appropriate description clause.
> And by using the typedef, the model actually becomes more readable.
>
> > Second, even if the data model becomes more compact, the
> > instance data with an instance-identifier is more verbose and maybe
> > harder to read for an operator (less "direct").
>
> I love to hear from operators that they find
>
> /nt:network[foo]/nt:node[bar]/nt:termination-point[baz]
>
> more complicated than this:
>
>
> <nt:network-ref>foo</nt:network-ref><nt:node-ref>bar</nt:node-ref><nt:termination-point>baz</nt:termination-point>
>
Oops, I got it wrong:
/nt:network[network-id="foo"]/nt:node[node-id="bar"]/nt:termination-point[tp-id="baz"]
<nt:network-ref>foo</nt:network-ref><nt:node-ref>bar</nt:node-ref><nt:tp-ref>baz</nt:tp-ref>
Anyway, if I count characters, the instance-identifier is still shorter.
/js
PS: If the argument is that operators can't understand instance identifier,
then NACM is horribly operationally broken. ;-)
--
Juergen Schoenwaelder Jacobs University Bremen gGmbH
Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany
Fax: +49 421 200 3103 <http://www.jacobs-university.de/>
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