Juergen Schoenwaelder <j.schoenwael...@jacobs-university.de> writes:
> On Sat, Jul 04, 2015 at 08:32:04AM +0200, Ladislav Lhotka wrote:
>>
>> >
>> > Consider this definition:
>> >
>> > rpc foo {
>> > input {
>> > leaf x {
>> > type uint8;
>> > must ". = ../y";
>> > }
>> > leaf y {
>> > type string;
>> > }
>> > }
>> > }
>> >
>> > Then what's the result of conceptual XPath evaluation for this RPC
>> > request?
>> >
>> > Just because you can construct a pathological
>> > case comparing strings and numbers doesn't
>> > mean anything.
>>
>> Pathological?? Don’t forget that uint64 numbers are encoded as strings in
>> JSON. Moreover, comparisons of two nodesets are *always* performed on string
>> values, even if both have numeric types in YANG.
>>
>> >
>> > Use "number(foo) < number(bar)" to ensure that
>> > numeric comparisons are done correctly.
>> >
>
> If this +1 != "1" needs fixing, I think it needs fixing in the YANG
> specification. For datastores, things are kind of handled since RFC
Yes.
> 6020 says:
>
> Note that since all leaf values in the data tree are conceptually
> stored in their canonical form (see Sections 7.6 and 7.7), any XPath
> comparisons are done on the canonical value.
Yes.
>
> For notifications, this is kind of handled as well:
>
> When a NETCONF server sends data, it MUST be in the canonical form.
>
> And of course, we expect the server to only send notifcations that are
> valid anyway.
>
> For RPCs, the obvious things to do would be to require that XPATH
> evaluation of RPC arguments also takes place on the canonical
> representation of values.
Agreed, perhaps the following change in sec. 6.4.1 could be sufficient:
OLD:
In the accessible tree, all leafs and leaf-lists with default values
in use exist (See Section 7.6.1 and Section 7.7.2).
NEW:
In the accessible tree, all leafs and leaf-lists with default values
in use exist (See Section 7.6.1 and Section 7.7.2), and all leaf and
leaf-list values are conceptually in the canoonical form.
Lada
>
> /js
>
> --
> 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/>
--
Ladislav Lhotka, CZ.NIC Labs
PGP Key ID: E74E8C0C
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