Unable to resolve parameters with a $ref.

[quangkhoa]

Open API supports a parameter being defined globally under a parameters property.

The current codebase seems to recognise this as shown here but it assumes that the parameters will be defined under the top level definitions property.

This is not the case. See attached
open-api-registry.yaml.txt for an example definition.

The resolving of ref's should be relative to the root Open API document.