Re: [netmod] xpath expressions in JSON
Andy Bierman <andy@yumaworks.com> Thu, 11 October 2018 02:23 UTC
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References: <20181010.131610.1510095762179710072.mbj@tail-f.com> <8736tevut6.fsf@nic.cz> <20181010.155915.278994099457235212.mbj@tail-f.com> <3B614CF4-9545-4C31-BEF4-CDFBF72AA045@cisco.com>
From: Andy Bierman <andy@yumaworks.com>
Date: Wed, 10 Oct 2018 19:23:36 -0700
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To: "Reshad Rahman (rrahman)" <rrahman@cisco.com>
Cc: Martin Bjorklund <mbj@tail-f.com>, "lhotka@nic.cz" <lhotka@nic.cz>, "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] xpath expressions in JSON
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On Wed, Oct 10, 2018 at 6:59 PM, Reshad Rahman (rrahman) <rrahman@cisco.com> wrote: > On 2018-10-10, 9:59 AM, "netmod on behalf of Martin Bjorklund" < > netmod-bounces@ietf.org on behalf of mbj@tail-f.com> wrote: > > Ladislav Lhotka <lhotka@nic.cz> wrote: > > 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). > > > > 2. use a module name rather than a prefix in XML, too. > > > > I would suggest #2. > <RR> But that means making non-backwards compatible change to the XML > representation? > Not really. It means NETMOD WG would be creating its own special variant of XPath. > Hmm, so you mean change the leaf "stream-xpath-filter" to say: > > o The set of namespace declarations has one member for each > YANG module supported by the server. This member maps > from the YANG module name to the YANG module namespace. > > This means that in the XPath expression, the module name > serves as the prefix. > > .... and then also give an example of this. > > This is probably what we need to do in all places where yang:xpath1.0 > is used, going forward. Maybe even define a new type > yang:xpath1.0-2 (name?) with the set of namespace declarations > built-in. > We should avoid making off-the-shelf implementations of standards like XPath unusable. At the very least this should be only available if the server supports it (with a capability URI) > <RR> So we need an update to RFC7951? > > Regards, > Reshad. > > Andy > > /martin > > > > > > > > > Lada > > > > > > > > How is this supposed to work with JSON? > > > > > > > > > /martin > > > > > > _______________________________________________ > > > netmod mailing list > > > netmod@ietf.org > > > https://www.ietf.org/mailman/listinfo/netmod > > > > -- > > Ladislav Lhotka > > Head, CZ.NIC Labs > > PGP Key ID: 0xB8F92B08A9F76C67 > > > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod > > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod >
- [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Reshad Rahman (rrahman)
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Qin Wu
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Vladimir Vassilev
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Vladimir Vassilev
- Re: [netmod] xpath expressions in JSON Vladimir Vassilev
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Reshad Rahman (rrahman)
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Reshad Rahman (rrahman)
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Reshad Rahman (rrahman)
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Vladimir Vassilev
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Reshad Rahman (rrahman)
- Re: [netmod] xpath expressions in JSON Vladimir Vassilev
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Juergen Schoenwaelder
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Juergen Schoenwaelder
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Andy Bierman
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Qin Wu
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Juergen Schoenwaelder
- Re: [netmod] xpath expressions in JSON Robert Wilton
- Re: [netmod] xpath expressions in JSON Juergen Schoenwaelder
- Re: [netmod] xpath expressions in JSON Ladislav Lhotka
- Re: [netmod] xpath expressions in JSON Juergen Schoenwaelder
- Re: [netmod] xpath expressions in JSON Martin Bjorklund
- Re: [netmod] xpath expressions in JSON Kent Watsen