.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0
.. Copyright (C) 2021-2022 Nordix Foundation

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CPS Path
########

.. toctree::
   :maxdepth: 1

Introduction
============

Several CPS APIs use the CPS path (or cpsPath in Java API) parameter.
The CPS path parameter is used for querying xpaths. CPS path is inspired by the `XML Path Language (XPath) 3.1. <https://www.w3.org/TR/2017/REC-xpath-31-20170321/>`_

This section describes the functionality currently supported by CPS Path.

Sample Yang Model
=================

.. code-block::

  module stores {
      yang-version 1.1;
      namespace "org:onap:ccsdk:sample";

      prefix book-store;

      revision "2020-09-15" {
          description
            "Sample Model";
      }
      container shops {

          container bookstore {

              leaf bookstore-name {
                  type string;
              }

              leaf name {
                  type string;
              }

              list categories {

                  key "code";

                  leaf code {
                      type uint16;
                  }

                  leaf name {
                      type string;
                  }

                  leaf numberOfBooks {
                      type uint16;
                  }

                  container books {

                      list book {
                          key title;

                          leaf title {
                              type string;
                          }
                          leaf price {
                              type uint16;
                          }
                          leaf-list label {
                              type string;
                          }
                          leaf-list edition {
                              type string;
                          }
                      }
                  }
              }
          }
      }
  }

**Note.** 'categories' is a Yang List and 'code' is its key leaf. All other data nodes are Yang Containers. 'label' and 'edition' are both leaf-lists.

**Note.** CPS accepts only json data. The xml data presented here is for illustration purposes only.

The json and xml below describes some basic data to be used to illustrate the CPS Path functionality.

Sample Data in Json
===================

.. code-block:: json

    {
      "shops": {
        "bookstore": {
          "bookstore-name": "Chapters",
          "name": "Chapters",
          "categories": [
            {
              "code": 1,
              "name": "SciFi",
              "numberOfBooks": 2,
              "books": {
                "book": [
                  {
                    "title": "2001: A Space Odyssey",
                    "price": 5,
                    "label": ["sale", "classic"],
                    "edition": ["1968", "2018"]
                  },
                  {
                    "title": "Dune",
                    "price": 5,
                    "label": ["classic"],
                    "edition": ["1965"]
                  }
                ]
              }
            },
            {
              "code": 2,
              "name": "Kids",
              "numberOfBooks": 1,
              "books": {
                "book": [
                  {
                    "title": "Matilda"
                  }
                ]
              }
            }
          ]
        }
      }
    }

Sample Data in XML
==================

.. code-block:: xml

    <shops>
       <bookstore name="Chapters">
          <bookstore-name>Chapters</bookstore-name>
          <categories code=1 name="SciFi" numberOfBooks="2">
             <books>
                <book title="2001: A Space Odyssey" price="5">
                   <label>sale</label>
                   <label>classic</label>
                   <edition>1968</edition>
                   <edition>2018</edition>
              </book>
                <book title="Dune" price="5">
                   <label>classic</label>
                   <edition>1965</edition>
                </book>
             </books>
          </categories>
          <categories code=2 name="Kids" numberOfBooks="1">
             <books>
                <book tit<style>
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