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Re: [netmod] xpath expressions in JSON

Vladimir Vassilev <vladimir@transpacket.com> Thu, 11 October 2018 11:00 UTC

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To: Andy Bierman <andy@yumaworks.com>, Martin Bjorklund <mbj@tail-f.com>
Cc: NetMod WG <netmod@ietf.org>
References: <20181010.155915.278994099457235212.mbj@tail-f.com> <3B614CF4-9545-4C31-BEF4-CDFBF72AA045@cisco.com> <CABCOCHT32pSP3raNj6pP3BY9ji4DnOoOAaKVY7QyfV4tqqp9KA@mail.gmail.com> <20181011.083904.763170181197608903.mbj@tail-f.com> <CABCOCHQ58Z0TpVLGVcw_TT-OG+1pWQERyCnU7NFO_Gob7JLLcA@mail.gmail.com>
From: Vladimir Vassilev <vladimir@transpacket.com>
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Date: Thu, 11 Oct 2018 13:00:27 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/jGfjrfcm6whGEt9no1cI0CbhZ_A>
Subject: Re: [netmod] xpath expressions in JSON
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On 10/11/18 11:21 AM, Andy Bierman wrote:
>
> So you must mean the full module name will be used at every node:
>
>  /ietf-interfaces:interfaces/ietf-interfaces:interface[ietf-interfaces:name='eth0']

Length is the only real problem I see with the solution. The lexical 
representation of identityref type has made a compromise accepting 
prefix instead of module name. This has its own unsolved issues but 
those could be addressed by a limitation not allowing modules with 
identical prefix statements to define homonyme data nodes and identities 
(which is not the case currently). If this is done module name can be 
replaced with prefix and the instance-identifiers will be shorter and 
encoding independent but still Xpath 1.0 compatible:

  /if:interfaces/if:interface[if:name='eth0']

Vladimir

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