Ladislav Lhotka <[email protected]> wrote:
>
> > On 19 Nov 2015, at 10:38, Martin Bjorklund <[email protected]> wrote:
> >
> > Andy Bierman <[email protected]> wrote:
> >> Hi,
> >>
> >> This text in 7.21.5 is not clear:
> >>
> >> A leaf that is a list key MUST NOT have a "when" statement.
> >>
> >> I think you mean that no when-stmt can use the key leaf as
> >> a context node.
> >>
> >> These are illegal in YANG 1.1 I think:
> >>
> >>
> >> augment /listX {
> >> when "foo";
> >> leaf key1 { ... }
> >> }
> >
> > Why would this be illegal? You didn't show the definition of listX,
> > but it cannot have "key1" as one of its keys.
>
> I think Andy has a point, here is a complete example:
>
> leaf foo {
> type empty;
> }
> list array {
> key "key1";
> leaf bar {
> type empty;
> }
> }
> augment "/array" {
> when "../foo";
> leaf key1 {
> type uint8;
> }
> }
I don't think this is legal even w/o the "when" statement. RFC 6020
says in 7.8.2 about the "key" statetement:
Each such leaf identifier MUST refer to a child leaf of the
list. The leafs can be defined directly in substatements to the
list, or in groupings used in the list.
I.e., it is not legal to augment a key. (I noticed that pyang doesn't
detect this...)
> Without the "when" statement it is perfectly okay but here the
> presence of "foo" makes "key1" disappear but "array" remains.
>
> >
> >> OR
> >>
> >>
> >> list listX {
> >> key key1;
> >> uses grouping1 {
> >> when "foo";
> >> // leaf key1 added via grouping
> >> }
> >> }
> >
> > Why would this be illegal?
>
> Similar as above.
Ah, ok, yes this should be illegal.
I think we need to add specific text for this scenario:
If a leaf key is defined in a grouping that is used in a list, the
"uses" statement MUST NOT have a "when" statement.
/martin
>
> Lada
>
> >
> >> There are more ways that the key-leaf can inherit a when-stmt
> >> but you get the idea.
> >
> > I don't think a key leaf can "inherit" a when statement.
> >
> >> The phrase "have a when-stmt" should be clear.
> >> It implies that the when-stmt is a sub-statement of the leaf-stmt
> >> but this is only 1 way the key leaf can be conditional.
> >
> >
> >
> > /martin
> >
> > _______________________________________________
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> > [email protected]
> > https://www.ietf.org/mailman/listinfo/netmod
>
> --
> Ladislav Lhotka, CZ.NIC Labs
> PGP Key ID: E74E8C0C
>
>
>
>
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