just could not find in the API document
Yes, the swagger (open api spec) definition is available from Activiti version 6 onwards - Activiti/activiti.json at 6.x · Activiti/Activiti · GitHub. There is currently no RAML files available for the community version.
If you are using Alfresco Process Services (enterprise version) the swagger & raml files of the enterprise apis are also available in the product.
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