Add provisional Attribute defn to Swagger (#251)
Add provisional Attribute defn to Swagger (#251)

* Add provisional Attribute defn

* better examples

* Use single element list for unary ops

all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench,all-of-us/workbench