Re: [netconf] YANG attributes in a datastore

Hi,

Michal Vaško <mvasko@cesnet.cz> wrote:
> Hello,
> we are thinking about adding support for arbitrary attributes [1] in
> our YANG/NETCONF datastore. To my knowledge, only the representation
> in XML or JSON is defined and standardized but there are no guidelines
> for editing (CRUD) these attributes.
> 
> So, my question is a rather general one, regarding implementations
> that support editing these attributes, would you mind sharing some
> basic ideas or principles used? Or is this outside any consensus and
> each implementation is free to handle this completely in its own
> fashion? Thanks for any input.

I think this depends on the attribute defintion.  Some attributes are
read-only from the northbound's protocol point of view.  Internally in
the server you may need some API to set/change them of course.  Some
other attributes are read-write.

In our implementation we support a few read-write attributes (and some
read-only).  Here's a simple example (in an edit-config):

  <foo annotation="hello"/>

This would set/change the "annotation" attribute's value to
"hello", regardless of its previous value.

To delete an annotation, you would do:

  <foo annotation=""/>

Each of our attributes has a special value that means "delete" (in
most cases it is the empty string.

/martin

> 
> Regards,
> Michal
> 
> [1] https://tools.ietf.org/html/rfc7952
> 
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