Re: [netmod] tree diagrams - flags

[Martin Bjorklund <[e-mail]>]

[e-mail] (Dale R. Worley) wrote:
> Martin Bjorklund <[e-mail]> writes:
> > Hmm, "*" was choosen b/c people are used to read it as
> > "zero or more".  So for example:
> >
> >      +---c server* [name]
> >          +--c name          string
> >          ...
> >
> > means zero or more "server" elements.  Each indexed by "name".
> 
> From RFC 7223:
> 
>    module ietf-interfaces {
>      ...
>      container interfaces {
>        ...
>        list interface {
>          key "name";
> 
>          leaf name {
>            type string;
>          }
> 
>          leaf description {
>            type string;
>          }
>    ...
> 
> There is a top-level container node "interfaces", which contains a list
> node "interface", which contains a sequence of list elements which
> consist of groups of (a leaf "name", a leaf "description", etc.), which
> elements are indexed by the value of the "name" leaf.

Aha, ok.  This description is not a correct description of the YANG
data tree (in which XPath expressions etc are evaluated).  There is
not a single "list node" called "interfaces".  Look at an example of
an XML instance document:

  <interfaces>
    <interface>
      <name>eth0</name>
      ...
    </interface>
    <interface>
      <name>eth1</name>
      ...
    </interface>
  </interfaces>

This also reflects the data tree.


/martin