> For the complete documentation index, see [llms.txt](https://docs-launchpad.energyweb.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-launchpad.energyweb.org/energy-solutions/digital-spine-by-energy-web/component-guides/ddhub-client-gateway/technical-guide/topics.md). # Topics ## Overview Topics are data schemas that define and standardize the payload of messages sent between different actors in the platform. Topics are grouped under [Applications ](/energy-solutions/digital-spine-by-energy-web/component-guides/self-sovereign-identities/technical-guide/applications.md)and administered by Application owners (specifically Admin Users in the Client Gateway). They can be updated over time to accommodate changes in the data schema through versioning. There are 4 types of data schema supported in the Client Gateway topics which are: * JSD7 * XML * CSV * TSV *** ## User Guide ### Pre-requisites * Authorization to Client Gateway * `topiccreator` role ### Create a Topic 1. Navigate to `Topic Management` and select an application for your new topic

2. Click `Create`

3. Fill up the create topic form and click `Save` {% hint style="success" %} Organize your topics effectively by using tags {% endhint %}

4. Success message will be shown, click `Dismiss` to close modal and view the topic list

### Modify a Topic 1. Search for the topic that you would like to modify. Click on the `︙` button at the end of the record row and choose `View version history`

2. Click on the `︙` button of the topic version you would like to update and choose `Update`

3. Make changes to the schema, you may also bump the version and the older version will keep the original schema instead

4. Success message will be shown, click `Dismiss` to close modal and view the version history list

### Remove a Version History 1. Click on the `︙` button of the topic version you would like to remove and choose `Remove`

2. A confirmation modal will appear, click `Confirm` to remove the version history from topic or `Cancel`

Delete version history confirmation modal

3. Success message will be shown, click `Dismiss` to close modal and view the version history list

### Remove a Topic 1. Search for the topic that you would like to remove. Click on the `︙` button at the end of the record row and choose `Remove`

2. A confirmation modal will appear, click `Confirm` to remove the topic or `Cancel`

3. Success message will be shown, click `Dismiss` to close modal and view the topics list