Is it possible to take union of two enums or subset of enums in swagger defination schemas?
This answer might be of help to you: https://community.smartbear.com/t5/SwaggerHub-Questions/quot-Extending-quot-objects-using-quot-allOf...
Using allOf it is possible to make a union (apparently because of a bug in Swagger). Be aware that values that are in both sets will appear twice in the resulting set!
