# Serverless Workflow Specification

This document describes the information about the implementation of the Cloud Native Computing Foundation (CNCF) Serverless Workflow specification. xFlow implements version **0.8** of the Serverless Workflow specification with some extensions.

The following table shows the implementation status for each Serverless Workflow specification feature.

#### Table 1. Implementation status symbols

| **Symbol**                               | **Description**                                                                    |
| ---------------------------------------- | ---------------------------------------------------------------------------------- |
| <mark style="color:red;">**X**</mark>    | Not implemented                                                                    |
| <mark style="color:yellow;">**P**</mark> | Partially implemented feature                                                      |
| <mark style="color:blue;">**F**</mark>   | Fully implemented feature and compliant with the Serverless Workflow specification |

#### Table 2. Implementation status of the Serverless Workflow specification features

<table data-header-hidden><thead><tr><th></th><th width="86"></th><th></th><th width="91"></th><th width="72"></th><th></th><th></th></tr></thead><tbody><tr><td><strong>Feature</strong></td><td><strong>Status</strong></td><td><strong>Reference</strong></td><td><strong>Priority</strong></td><td><strong>Plan</strong></td><td><strong>Notes</strong></td><td><strong>Implement Status</strong></td></tr><tr><td>Constants</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow Constants</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:red;"><strong>X</strong></mark></td></tr><tr><td>Timeouts</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow Timeouts</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:yellow;"><strong>P</strong></mark> - Only support: Event Timeout + Workflow Execution Timeout</td></tr><tr><td>Serverless Workflow data</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow Data</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:blue;"><strong>F</strong></mark></td></tr><tr><td>Functions</td><td><mark style="color:yellow;"><strong>P</strong></mark></td><td>Function Definition</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:yellow;"><strong>P</strong></mark></td></tr><tr><td>Retries</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Retry Definition</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:blue;"><strong>F</strong></mark></td></tr><tr><td>Compensation</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow Compensation</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:blue;"><strong>F</strong></mark></td></tr><tr><td>Error handling</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow Error Handling</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:blue;"><strong>F</strong></mark></td></tr><tr><td>Expressions</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow Expressions</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:blue;"><strong>F</strong></mark></td></tr><tr><td>States</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow States</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:blue;"><strong>F</strong></mark></td></tr><tr><td>Events</td><td><mark style="color:yellow;"><strong>P</strong></mark></td><td>Event Definition</td><td>1</td><td>v1.0</td><td></td><td><mark style="color:blue;"><strong>F</strong></mark></td></tr><tr><td>Secrets</td><td><mark style="color:blue;"><strong>F</strong></mark></td><td>Workflow Secrets</td><td>4</td><td>v1.2</td><td></td><td><mark style="color:red;"><strong>X</strong></mark></td></tr></tbody></table>

#### Table 3. Workflow States implementation status

| **State**                                                                        | **Status**                             | **Reference**   | **Priority** | **Plan** | **Notes**                        | **Implement Status**                                           |
| -------------------------------------------------------------------------------- | -------------------------------------- | --------------- | ------------ | -------- | -------------------------------- | -------------------------------------------------------------- |
| [Callback](/xflow/developer-guide/workflow-states-reference/callback-state.md)   | <mark style="color:blue;">**F**</mark> | Callback State  | 1            | v1.0     |                                  | <mark style="color:blue;">**F**</mark>                         |
| [Event](/xflow/developer-guide/workflow-states-reference/event-state.md)         | <mark style="color:blue;">**F**</mark> | Event State     | 1            | v1.0     | v1.0 supports 1 start event only | <mark style="color:blue;">**F**</mark>                         |
| [ForEach](/xflow/developer-guide/workflow-states-reference/foreach-state.md)     | <mark style="color:blue;">**F**</mark> | ForEach State   | 2            | v1.0     |                                  | <mark style="color:blue;">**F**</mark>                         |
| [Parallel](/xflow/developer-guide/workflow-states-reference/parallel-state.md)   | <mark style="color:blue;">**F**</mark> | Parallel State  | 2            | v1.0     |                                  | <mark style="color:blue;">**F**</mark>                         |
| [Operation](/xflow/developer-guide/workflow-states-reference/operation-state.md) | <mark style="color:blue;">**F**</mark> | Operation State | 1            | v1.0     |                                  | <mark style="color:blue;">**F**</mark>                         |
| [Switch](/xflow/developer-guide/workflow-states-reference/switch-state.md)       | <mark style="color:blue;">**F**</mark> | Switch State    | 1            | v1.0     |                                  | <mark style="color:yellow;">**P**</mark> - only data condition |
| [Inject](/xflow/developer-guide/workflow-states-reference/inject-state.md)       | <mark style="color:blue;">**F**</mark> | Inject State    | 3            | v1.1     |                                  | <mark style="color:red;">**X**</mark>                          |

#### Table 4. Workflow Functions implementation status

| **Function** | **Status**                             | **Reference**                                     | **Priority** | **Plan** | **Notes**                              |
| ------------ | -------------------------------------- | ------------------------------------------------- | ------------ | -------- | -------------------------------------- |
| REST         | <mark style="color:blue;">**F**</mark> | Using Functions for RESTful Service Invocations   | 1            | v1.0     | <mark style="color:blue;">**F**</mark> |
| Expression   | <mark style="color:blue;">**F**</mark> | Using Functions for Expression Evaluation         | 1            | v1.0     | <mark style="color:red;">**X**</mark>  |
| Custom       | <mark style="color:blue;">**F**</mark> | Defining custom function types                    | 1            | v1.0     | <mark style="color:blue;">**F**</mark> |
| RPC          | <mark style="color:blue;">**F**</mark> | Using Functions for RPC Service Invocations       | 2            | v1.1     | <mark style="color:red;">**X**</mark>  |
| GraphQL      | <mark style="color:blue;">**F**</mark> | Using Functions for GraphQL Service Invocations   | 2            | v1.1     | <mark style="color:blue;">**F**</mark> |
| Async API    | <mark style="color:red;">**X**</mark>  | Using Functions for Async API Service Invocations | TBU          | TBU      | <mark style="color:red;">**X**</mark>  |
| OData        | <mark style="color:red;">**X**</mark>  | Using Functions for OData Service Invocations     | TBU          | TBU      | <mark style="color:red;">**X**</mark>  |


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