From 55dc654964942aa67c48f09b0ba56059be8e923b Mon Sep 17 00:00:00 2001
From: Ruslan Kashapov <ruslan.kashapov@pantheon.tech>
Date: Tue, 2 Mar 2021 16:48:41 +0200
Subject: Docs: overview, architecture, design, modeling

Issue-ID: CPS-268
Change-Id: I31480a9a6186af0ddedae4f0eca06a744a2e2d64
Signed-off-by: Ruslan Kashapov <ruslan.kashapov@pantheon.tech>
---
 docs/architecture.rst | 65 ++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 62 insertions(+), 3 deletions(-)

(limited to 'docs/architecture.rst')

diff --git a/docs/architecture.rst b/docs/architecture.rst
index c613e4ff95..51acf66f0e 100644
--- a/docs/architecture.rst
+++ b/docs/architecture.rst
@@ -1,5 +1,64 @@
-..  Copyright (C) 2021 Nordix Foundation
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright (C) 2021 Nordix Foundation, Pantheon.tech
 .. _architecture:
 
-CPS in ONAP Architecture
---------------------------
\ No newline at end of file
+CPS Architecture
+################
+
+.. toctree::
+   :maxdepth: 1
+
+
+High Level Component Definition and Architectural Relationships
+===============================================================
+
+The Configuration Persistence Service (CPS) provides storage for run-time configuration and operational
+parameters that need to be used by ONAP.
+
+In this release the CPS is a stand-alone component. Project page describing eventual scope and ambition is here:
+`Configuration Persistence Service Project <https://wiki.onap.org/display/DW/Configuration+Persistence+Service+Project>`_ 
+
+This page reflects the state for Honolulu-R8 release.
+
+.. image:: _static/cps-r8-arch-diagram.png
+
+API definitions
+===============
+
+Configuration Persistence Service provides following interfaces.
+
+.. list-table::
+   :header-rows: 1
+
+   * - Interface name
+     - Interface definition
+     - Interface capabilities
+     - Protocol
+   * - CPS-E-01
+     - Administrative Data Management
+     - - create/delete dataspace
+       - create/delete schema set
+       - create/delete anchor
+     - REST
+   * - CPS-E-02
+     - Generic Data Access
+     - - create data node
+       - read data node by xpath with or without descendants
+       - update data node by xpath with or without descendants
+     - REST
+   * - CPS-E-03
+     - Generic Data Search
+     - - query data nodes by xpath prefix and attribute value
+     - REST
+   * - CPS-E-04
+     - Change Notification
+     - *Not available in Honolulu-R8*
+     - *N/A*
+   * - CPS-E-05
+     - xNF Data Access
+     - - read xNF data
+       - query xNF data
+     - REST
+
+The CPS Basic Concepts are described in :doc:`modeling`.
-- 
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