Simple 2.0 spec example

Here is a first example of the proposed 2.0 spec for comment
Do we have an option of standardizing on either jsonschema Draft3 or Draft4 style `required` fields? I know in the 1.2 spec, the inconsistency in style between Models and ParameterObjects makes it hard (although not impossible) to build validation tools over the top of the swagger definition. Has this standardization already been considered and rejected in the past?