Re: [netmod] xpath expressions in JSON

-----邮件原件-----
发件人: netmod [mailto:netmod-bounces@ietf.org] 代表 Ladislav Lhotka
发送时间: 2018年10月10日 20:41
收件人: Martin Bjorklund; netmod@ietf.org
主题: Re: [netmod] xpath expressions in JSON

Martin Bjorklund <mbj@tail-f.com> writes:

> Hi,
>
> While reviewing restconf-notif, I saw this example:
>
>    {
>       "ietf-subscribed-notifications:input": {
>          "stream": "NETCONF",
>          "stream-xpath-filter": "/ds:foo/",
>          "dscp": "10"
>       }
>    }
>
> Note the "stream-xpath-filter".  It has a prefix in the XPath string.
> How are prefixes declared when JSON is used?
>
> The leaf "stream-xpath-filter" says:
>
>               o  The set of namespace declarations are those in scope on
>                  the 'stream-xpath-filter' leaf element.
>
> (I think I provided that text...)
>
> This assumes that the encoding is XML, or at leas that the encoding 
> can somehow transfer namespace declarations.

It can't. There are two options:

1. have different representations of this value in XML and JSON,
   analogically to instance indentifiers (sec. 6.11 in RFC 7951).

[Qin]: This has been brought up before:
https://www.ietf.org/mail-archive/web/netconf/current/msg15501.html

2. use a module name rather than a prefix in XML, too.

I would suggest #2.

Lada

>
> How is this supposed to work with JSON?
>
>
> /martin
>
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--
Ladislav Lhotka
Head, CZ.NIC Labs
PGP Key ID: 0xB8F92B08A9F76C67

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