anchor.diff:  The MP OpenAPI specification also provides a <<Programming model>> that allows
   application developers to provide a bootstrap or complete OpenAPI model tree.
   
  -Lastly, a <<Filter>> is described which can update different parts of the OpenAPI
  -document during various processing stages independently of which documentation
  -mechanisms are being used.
  +Lastly, a <<Filter>> is described which can update the OpenAPI model after it has
  +been built from the previously described documentation mechanisms.
   
   === Annotations
   
  
positive.code: 
  There are many scenarios where application developers may wish to update or remove
  certain elements and fields of the OpenAPI document.  This is done via a filter,
  which is called during various stages of the processing lifecycle.
  
  ==== OASFilter
  
  
negative.code: 
  1. Fetch configuration values from `mp.openapi` namespace
  2. Call OASModelReader
  3. Fetch static OpenAPI file
  4. Process annotations
  5. Filter model via OASFilter
  
  **Example processing**:
  
  * A vendor starts by fetching all available <<Configuration>>.  If
  an `OASModelReader` was specified in that configuration list, its `buildModel`
  method is called to form the starting OpenAPI model tree for this application.
  * Any <<Vendor specific configuration>> are added on top of that starting model (overriding
  conflicts), or create a new model if an `OASModelReader` was not registered.
  * The vendor searches for a file as defined in the section <<Static OpenAPI files>>.
  If found, it will read that document and merge with the model produced by previous
  processing steps (if any), where conflicting elements from the static file will override
  the values from the original model.
  * If annotation scanning was not disabled, the JAX-RS and OpenAPI annotations from
  the application will be processed, further overriding any conflicting elements
  from the current model.
  * The final model is filtered by walking the model tree and invoking all registered
  <<OASFilter>> classes.
  
  == OpenAPI Endpoint
  
  