Starting from Denodo Platform 7.0, Swagger Specification for REST Web Services has been added as a [New Feature (Web Service)](https://community.denodo.com/docs/html/browse/7.0/platform/new_features/new_features_virtual_dataport#web-services).
In order to get Swagger Specification for a published web service, I would use Denodo Platform 7.0.
Regarding your queries:
1) While deploying the Web Service, /OpenAPI/swagger.json or /OpenAPI/swagger.yaml will be appended and will be available in the Summary Tab of the Web Service.
2) Swagger Specifications is only available for REST web services, not the RESTful web service
For more details, refer [OpenAPI/Swagger](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/publication_of_web_services/publishing_rest_web_services/settings_tab_rest#openapi-swagger) section under the Virtual DataPort Administration Guide.
Hope this helps!