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+.. This work is a derivative of https://wiki.onap.org/display/DW/Modeling+Concepts#Concepts-100023263 by IBM
+.. used under Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright (C) 2020 Deutsche Telekom AG.
+
+.. _workflow:
+
+Workflow
+---------
+
+.. note::
+
+ **Workflow Scope within CDS Framework**
+
+ The workflow is within the scope of the micro provisioning and configuration
+ management in **controller domain** and does NOT account for the MACRO service orchestration workflow which is covered by the SO Project.
+
+A workflow defines an overall action to be taken on the service, hence is an
+entry-point for the run-time execution of the :ref:`CBA Package <cba>`.
+
+A workflow also defines **inputs** and **outputs** that will defined the **payload contract**
+of the **request** and **response** (see :ref:`Dynamic API`)
+
+A workflow can be **composed** of one or multiple **sub-actions** to execute.
+
+A CBA package can have as **many workflows** as needed.
+
+.. _workflow_single_action:
+
+Single action
+**************
+
+The workflow is directly backed by a component (see :ref:`node_type` -> Component).
+
+In the example bellow, the target of the workflow's steps resource-assignment is ``resource-assignment``
+which actually is the name of the ``node_template`` defined after, of type ``component-resource-resolution``.
+
+`Link to example
+<https://github.com/onap/ccsdk-cds/blob/master/components/model-catalog/blueprint-model/test-blueprint/golden/Definitions/golden-blueprint.json#L40-L71>`_
+
+
+.. code-block:: json
+ :caption: **Example**
+
+ . . .
+ "topology_template": {
+ "workflows": {
+ "resource-assignment": {
+ "steps": {
+ "resource-assignment": {
+ "description": "Resource Assign Workflow",
+ "target": "resource-assignment"
+ ]
+ }
+ },
+ "inputs": {
+ "resource-assignment-properties": {
+ "description": "Dynamic PropertyDefinition for workflow(resource-assignment).",
+ "required": true,
+ "type": "dt-resource-assignment-properties"
+ }
+ },
+ "outputs": {
+ "meshed-template": {
+ "type": "json",
+ "value": {
+ "get_attribute": [
+ "resource-assignment",
+ "assignment-params"
+ ]
+ }
+ }
+ }
+ },
+ "node_templates": {
+ "resource-assignment": {
+ "type": "component-resource-resolution",
+ "interfaces": {
+ "ResourceResolutionComponent": {
+ "operations": {
+ "process": {
+ "inputs": {
+ "artifact-prefix-names": [
+ "vf-module-1"
+ ]
+ }
+ }
+ }
+ }
+ },
+ "artifacts": {
+ "vf-module-1-template": {
+ "type": "artifact-template-velocity",
+ "file": "Templates/vf-module-1-template.vtl"
+ },
+ "vf-module-1-mapping": {
+ "type": "artifact-mapping-resource",
+ "file": "Templates/vf-module-1-mapping.json"
+ }
+ }
+ }
+ }
+ . . .
+
+.. _workflow_multiple_actions:
+
+Multiple sub-actions
+**********************
+
+The workflow is backed by a Directed Graph engine, dg-generic (see :ref:`node_type` -> DG,
+and is an **imperative** workflow.
+
+A DG used as workflow for CDS is composed of multiple execute nodes; each individual
+execute node refers to an modelled Component (see :ref:`node_type` -> Component) instance.
+
+In the example above, you can see the target of the workflow's steps execute-script is
+``execute-remote-ansible-process``, which is a node_template of type ``dg_generic``
+
+`Link of example
+<https://github.com/onap/ccsdk-cds/blob/master/components/model-catalog/blueprint-model/test-blueprint/remote_scripts/Definitions/remote_scripts.json#L184-L204>`_
+
+.. code-block:: json
+ :caption: **workflow plan example**
+
+ . . .
+ "topology_template": {
+ "workflows": {
+ "execute-remote-ansible": {
+ "steps": {
+ "execute-script": {
+ "description": "Execute Remote Ansible Script",
+ "target": "execute-remote-ansible-process"
+ ]
+ }
+ },
+ "inputs": {
+ "ip": {
+ "required": false,
+ "type": "string"
+ },
+ "username": {
+ "required": false,
+ "type": "string"
+ },
+ "password": {
+ "required": false,
+ "type": "string"
+ },
+ "execute-remote-ansible-properties": {
+ "description": "Dynamic PropertyDefinition for workflow(execute-remote-ansible).",
+ "required": true,
+ "type": "dt-execute-remote-ansible-properties"
+ }
+ },
+ "outputs": {
+ "ansible-variable-resolution": {
+ "type": "json",
+ "value": {
+ "get_attribute": [
+ "resolve-ansible-vars",
+ "assignment-params"
+ ]
+ }
+ },
+ "prepare-environment-logs": {
+ "type": "string",
+ "value": {
+ "get_attribute": [
+ "execute-remote-ansible",
+ "prepare-environment-logs"
+ ]
+ }
+ },
+ "execute-command-logs": {
+ "type": "string",
+ "value": {
+ "get_attribute": [
+ "execute-remote-ansible",
+ "execute-command-logs"
+ ]
+ }
+ }
+ }
+ }
+ },
+ "node_templates": {
+ "execute-remote-ansible-process": {
+ "type": "dg-generic",
+ "properties": {
+ "content": {
+ "get_artifact": [
+ "SELF",
+ "dg-execute-remote-ansible-process"
+ ]
+ },
+ "dependency-node-templates": [
+ "resolve-ansible-vars",
+ "execute-remote-ansible"
+ ]
+ },
+ "artifacts": {
+ "dg-execute-remote-ansible-process": {
+ "type": "artifact-directed-graph",
+ "file": "Plans/CONFIG_ExecAnsiblePlaybook.xml"
+ }
+ }
+ }
+
+Properties of a workflow
+**************************
+
+.. list-table::
+ :widths: 25 75
+ :header-rows: 1
+
+ * - Property
+ - Description
+ * - workflow-name
+ - Defines the name of the action that can be triggered by external system
+ * - inputs
+ - | They are two types of inputs, the dynamic ones, and the static one.
+ |
+
+ .. tabs::
+
+ .. tab:: static
+
+ Specified at workflow level
+
+ * can be inputs for the Component(s), see the inputs section of the component of interest.
+ * represent inputs to derived custom logic within scripting
+
+ These will end up under ``${actionName}-request`` section of the payload (see Dynamic API)
+
+ .. tab:: dynamic
+
+ Represent the resources defined as input (see :ref:`node_type` -> Source -> Input)
+ within mapping definition files (see :ref:`artifact_type` -> Mapping).
+
+ The **enrichment process** will (see :ref:`enrichment`)
+
+ * dynamically gather all of them under a data-type, named ``dt-${actionName}-properties``
+ * will add it as a input of the workflow, as follow using this name: ``${actionName}-properties``
+
+ Example for workflow named `resource-assignment`:
+
+ .. code-block:: json
+ :caption: **dynamic input**
+
+ "resource-assignment-properties": {
+ "required": true,
+ "type": "dt-resource-assignment-properties"
+ }
+ * - outputs
+ - | Defines the outputs of the execution; there can be as many output as needed.
+ | Depending on the Component (see :ref:`node_type` -> Component) of use, some attribute might be retrievable.
+
+ .. list-table::
+ :widths: 50 50
+ :header-rows: 1
+
+ * - type
+ - value
+ * - data type (complex / primitive)
+ - value resolvable using :ref:`expression` -> get_attribute
+ * - steps
+ - | Defines the actual step to execute as part of the workflow
+ |
+ .. list-table::
+ :widths: 25 25 50
+ :header-rows: 1
+
+ * - step-name
+ - description
+ - target
+ * - name of the step
+ - step description
+ - | a node_template implementing on of the supported Node Type (see :ref:`node_type` -> DG),
+ either a Component or a DG
+ | (see :ref:`workflow_single_action` or :ref:`workflow_multiple_actions`)
+
+Example:
+
+.. code-block:: json
+ :caption: **workflow example**
+
+ {
+ "workflow": {
+ "resource-assignment": { <- workflow-name
+ "inputs": {
+ "vnf-id": { <- static inputs
+ "required": true,
+ "type": "string"
+ },
+ "resource-assignment-properties": { <- dynamic inputs
+ "required": true,
+ "type": "dt-resource-assignment-properties"
+ }
+ },
+ "steps": {
+ "call-resource-assignment": { <- step-name
+ "description": "Resource Assignment Workflow",
+ "target": "resource-assignment-process" <- node_template targeted by the step
+ }
+ },
+ "outputs": {
+ "template-properties": { <- output
+ "type": "json", <- complex type
+ "value": {
+ "get_attribute": [ <- uses expression to retrieve attribute from context
+ "resource-assignment",
+ "assignment-params"
+ ]
+ }
+ }
+ }
+ }
+ }
+ }
+
+`TOSCA definition <http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454203>`_
+