> For the complete documentation index, see [llms.txt](https://developer.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.collibra.com/workflows/creating-workflows/workflow-basic-configuration-elements/model-keys.md).

# Model keys

Model keys are unique identifiers for processes and forms in Workflow Designer workspaces. The process key also identifies workflows in Collibra and must be unique in your environment.

If you change the process key of a workflow and publish it again, it is considered as a completely new workflow and Collibra creates a different workflow definition for it.

If you publish a workflow with the same key as the key or the process ID of an already existing one, a new version of the same workflow is created. All running workflow instances keep running with the old version. All workflows started after publishing use the new version. The settings on the workflow definition remain the same and include any newly added configuration variables.

When you create new processes or forms, you must provide a key and one is automatically generated from the name of the model.

You can change the process key of a workflow:

* In the workflow BPMN: `<process id="approvalProcess" ...`
* In the Workflow Designer:

{% hint style="info" %}
Model keys cannot include special characters.
{% endhint %}