Re: [YANG] new pyang errors

Andy Bierman writes:
>Q1: Is the leaf mandatory?
>  Yes:  Q2: Is there a default-stmt for the leaf, or if not, is there
>            a default-stmt for the typedef used by the leaf?
>          No: missing mandatory data error
>         Yes: use the default value to instantiate the leaf node

If there's a reasonable default for the node, why would you mark it
as mandatory?  If there's a default, no one needs to create the
statement and is doesn't need to exist in the database.

What you are doing here is trying to make the meaning of mandatory
conditional based on the presence of a default.  This is confusing.

If something is mandatory, it must exist.  If there's a default,
it need not exist, since the default gives the value.  Making
the agent/manager/user/implementor ask your Q1 and Q2 is unnecessary.
The question is simply "does it exist?".  If it's mandatory and it
doesn't exist, it's an error.

Thanks,
 Phil

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