# 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

--- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs-launchpad.energyweb.org/energy-solutions/digital-spine-by-energy-web/component-guides/ddhub-client-gateway/technical-guide/topics.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.