Ideas for planned updates

[lornajane]

Some additional examples and updates to consider (make each one into an issue before you start working on it)

• callback
• examples for content type x-www-form-encoded and octet-stream
• Add a oneOf to the example API description #131
• XML schemas
• x-traitTag and x-summary usage examples #130
• better response examples

(original list from #7)