On Fri, Apr 2, 2021 at 10:23 AM Acee Lindem (acee) <acee= 40cisco....@dmarc.ietf.org> wrote:
> Hi Tony, > > I would argue that YANG is a data modeling language. Another disadvantage > of the bits type that it isn't augmentable with new bits. Hence, usage of > unused bits requires a new version of the module as opposed to an > augmentation. For that reason, we greatly limited their usage in routing > modules and used identities instead. > > The line between data model and implementation is blurry with YANG + extensions. Most of us want YANG data to be independent of the encoding format. > Thanks, > Acee > Andy > > On 4/2/21, 12:14 PM, "netmod on behalf of Tony Li" < > netmod-boun...@ietf.org on behalf of tony...@tony.li> wrote: > > > Hi Lada, > > Thanks for your reply. At heart, I guess I’m asking a more > fundamental question: is YANG intended as a data modelling language or as a > data structure modelling language? > > Your reply suggests the former: structure is irrelevant to YANG. If > that’s true, then what’s the point in ‘position’? And why do you need > ‘bits’ when you have ‘binary’? > > Confused, > Tony > > > > On Apr 2, 2021, at 1:27 AM, Ladislav Lhotka <ladislav.lho...@nic.cz> > wrote: > > > > Tony Li <tony...@tony.li> writes: > > > >> Hi, > >> > >> I have some basic questions about YANG. I’m pretty certain this is > NOT the right place to ask them, so please feel free to redirect me. > >> > >> > >> 1) Is there a way to define the width of an enumeration? Suppose I > had an enumeration that was in a 16 bit field, how do I describe that? > > > > In the description, if necessary. However, this should be an > implementation detail, as long as the underlying numeric type can > accommodate all enums. > > > > You could perhaps also define and enum for the highest possible > value and make in reserved. > > > >> > >> 2) How do I model a non-octet sized multi-bit field? For example, > if there is a 5 bit numeric value as part of some ‘bits’? Position only > takes a single value, I can’t really say ‘position 3-7’. > > > > In this case, I would question whether the 'bits' type is really > appropriate. It might be useful to split the value into multiple items in > YANG. > > > > Lada > > > >> > >> Thanks, > >> Tony > >> _______________________________________________ > >> netmod mailing list > >> netmod@ietf.org > >> https://www.ietf.org/mailman/listinfo/netmod > > > > -- > > Ladislav Lhotka > > Head, CZ.NIC Labs > > PGP Key ID: 0xB8F92B08A9F76C67 > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod >
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