Re: Possible bug with null document in libyaml

Hi Osamu,

> 
> According to the spec, this change was done for JSON compatibility.
> A YAML 1.2 processor seems to be required to construct a null object 
> from an empty node.
> 
> In this point, YAML 1.2 is completely incompatible from YAML 1.1.
> Please compare example 7.3 in YAML 1.2 spec with example 8.13 in 
> YAML 1.1 spec.
> 

I don't think it's the correct interpretation of the spec.  I'd say that 
YAML 1.2 provide a recommended scheme for tag resolution, while YAML 1.1 
doesn't, leaving the decision of choosing the default scheme to the 
processor authors.  I believe all existing YAML producers interpret an 
empty plain scalar as a null value unless instructed otherwise.

Thanks,
Kirill

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