[Teas] Query on multiple-inheritance models

Xufeng Liu <xufeng.liu.ietf@gmail.com> Tue, 28 July 2020 15:52 UTC

Return-Path: <xufeng.liu.ietf@gmail.com>
X-Original-To: teas@ietfa.amsl.com
Delivered-To: teas@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 10F553A0E10 for <teas@ietfa.amsl.com>; Tue, 28 Jul 2020 08:52:00 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.854
X-Spam-Level:
X-Spam-Status: No, score=-0.854 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, NORMAL_HTTP_TO_IP=0.001, NUMERIC_HTTP_ADDR=1.242, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r3XEoD5qGlha for <teas@ietfa.amsl.com>; Tue, 28 Jul 2020 08:51:57 -0700 (PDT)
Received: from mail-il1-x136.google.com (mail-il1-x136.google.com [IPv6:2607:f8b0:4864:20::136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8360E3A0E0E for <teas@ietf.org>; Tue, 28 Jul 2020 08:51:57 -0700 (PDT)
Received: by mail-il1-x136.google.com with SMTP id y18so8167938ilp.10 for <teas@ietf.org>; Tue, 28 Jul 2020 08:51:57 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=XqpyiIuuSvrlS8/LWpdEZcCzlCe5GwUdht9xDTAKaL8=; b=U8UPjLRgyqDVfQSzni+rrK0cCPAqdtz+pX9+e0p0JNQrydXwUaAhWHVB1BqO/FdTjs cvQubKrNnh0yimNr6HpLLn79cOlTdso21dgW81cXv9tItVRklJSaHtIW3iRGJ31XVN1H xn6b1KGJnpBHtyVZJhzU0tDDUa9Emjbl9uAdZb5kSvTlZ2Ba6SqmZZ+s1KkEdnu4Rf0D uIfRmTQ3j72vHBSyeFGaf0qggmsjjYfr+BlhQTMJVHqizyk/rL0FeptLTtVOodpNr5Wm nNe9JdSamDnvPkwPFRd6SD38xvEo00wZEjv+rLt64GfshCUsuyDhNcn4o2T0BzHMLy3I miAQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=XqpyiIuuSvrlS8/LWpdEZcCzlCe5GwUdht9xDTAKaL8=; b=oa1LalSz1cLuRDIpVpQozUwreiD2eHjxLrn3O0Cr4i8LdhpzFMq+WQuhti9+sU1ttZ HFnpM8Fvc3BmELiyLiodMr5ML5cv0XkRdC8tPPeYRuvt5jGVfVwEaFcbmAVc3r53uouV Yebi+KwL7ZAxEFJEyCkldtcdJROIuJLx/7ISj6QI47SxKhi4Oh+7Liz+W0Fa3VPVOx+t kY/QguC4+XBs2OJ6gWE3797VJ9vI4eDXkAY8NqsnusBgjQ9NPlFIA2bTe+c98X5rffPl 2ZCun3fYgF2sosuA9i6zH4uDedvOEDg6PYycrfVhL+N+dXwbIbbaA21GA0gqwajJIpee di1A==
X-Gm-Message-State: AOAM531Fok6B4qlHObuHOqdH/d6iDIzzz229rJQaSkHJrQHsbGb1X53c hK2iAAsgpF4i35bAmNTMhetXNHSRwhbKsCozefBGl6Uu
X-Google-Smtp-Source: ABdhPJzMcpE8CL47mExSH5VmlWskrK8QIHeKTGuQ//wSMzSzWvOkP0lym7Nx94jDKD2csOAUKInSHQ0YqWabNaYRsQE=
X-Received: by 2002:a05:6e02:80e:: with SMTP id u14mr15451873ilm.181.1595951516529; Tue, 28 Jul 2020 08:51:56 -0700 (PDT)
MIME-Version: 1.0
From: Xufeng Liu <xufeng.liu.ietf@gmail.com>
Date: Tue, 28 Jul 2020 11:51:45 -0400
Message-ID: <CAEz6PPS8_Uk1OjDsLwG+X7oYr9C4ubTDxn6_0uiVChC=ZDz1NQ@mail.gmail.com>
To: TEAS WG <teas@ietf.org>
Content-Type: multipart/mixed; boundary="0000000000003900d205ab826bd8"
Archived-At: <https://mailarchive.ietf.org/arch/msg/teas/hWHktBOcqVBI_YR2cIraztQ4dow>
Subject: [Teas] Query on multiple-inheritance models
X-BeenThere: teas@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Traffic Engineering Architecture and Signaling working group discussion list <teas.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/teas>, <mailto:teas-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/teas/>
List-Post: <mailto:teas@ietf.org>
List-Help: <mailto:teas-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/teas>, <mailto:teas-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 28 Jul 2020 15:52:00 -0000

During our regular YANG TE Model Design Discussion meeting, we received a
question about how to do queries on the data of the models with multiple
inheritances. This email is an attempt to show such a query with XPath by
an example.

The statement is that a query is as easy on a multiple-inheritance model as
on a linearly-augmented model.

As an example, the module ietf-sr-mpls-topology described in
draft-ietf-teas-yang-sr-te-topo is used. An SR MPLS TE topology instance
can be configured by using multiple inheritances from both
ietf-l3-unicast-topology and ietf-te-topology. Attached are two
configuration instances of SR MPLS topology, one of which is non-TE with
network-id "sr-topo-example" (that is the data example in Appendix B of
draft-ietf-teas-yang-sr-te-topo), and the other of which is TE enabled with
network-id "sr-te-topo-example". Both instances will co-exist in the
datastore if both JSON files are sent to the server.

To query on the information of the SR MPLS TE instance
"sr-te-topo-example", the following XPath can be used:

/networks/network[network-types/l3t:l3-unicast-topology/srmt:sr-mpls][network-types/tet:te-topology]

To retrieve the information for node "D1" of the instance
"sr-te-topo-example", the following XPath can be used:

xget
/networks/network[network-types/l3t:l3-unicast-topology/srmt:sr-mpls][network-types/tet:te-topology]/node[node-id='D1'

The server will reply with the following data:

{
  "ietf-network:networks": {
    "network": [
      {
        "network-id":"sr-te-topo-example",
        "node": [
          {
            "node-id":"D1",
            "ietf-l3-unicast-topology:l3-node-attributes": {
              "router-id": [
                "203.0.113.1"
              ],
              "prefix": [
                {
                  "prefix":"203.0.113.1/32",
                  "ietf-sr-mpls-topology:sr-mpls": {
                    "start-sid":101,
                    "range":1,
                    "is-local":false,
                    "is-node":true
                  }
                }
              ],
              "ietf-sr-mpls-topology:sr-mpls": {
                "srgb": [
                  {
                    "lower-bound":16000,
                    "upper-bound":23999
                  }
                ],
                "srlb": [
                  {
                    "lower-bound":15000,
                    "upper-bound":15999
                  }
                ]
              }
            },
            "ietf-te-topology:te": {
              "te-node-attributes": {
                "admin-status":"up",
                "connectivity-matrices": {
                },
                "domain-id":1001,
                "is-abstract":[null],
                "signaling-address": [
                  "203.0.113.1"
                ]
              }
            },
            "ietf-te-topology:te-node-id":"203.0.113.1",
            "ietf-network-topology:termination-point": [
              {
                "tp-id":"1-0-1",
                "ietf-l3-unicast-topology:l3-termination-point-attributes":
{
                  "unnumbered-id":101
                }
              },
              {
                "tp-id":"1-2-1",
                "ietf-l3-unicast-topology:l3-termination-point-attributes":
{
                  "unnumbered-id":121
                }
              },
              {
                "tp-id":"1-3-1",
                "ietf-l3-unicast-topology:l3-termination-point-attributes":
{
                  "unnumbered-id":131
                }
              }
            ]
          }
        ]
      }
    ]
  }
}

Thanks,
- Xufeng