For `title` and `version` I’d use properties inste...

# dsl

[orangy]

For title and version I’d use properties instead:

openapi {
    info {
        title = "Swagger Petstore" 
        version = "1.0.0" 
    }
}

They don’t prevent setting property twice, but at least they convey familiar semantics, so if you set it twice, you essentially overwrite the value, which is quite expected