func (r Ref) Required() []string {
	if refIF, ok := r["required"]; ok {
		return refIF.([]string)
	}
	return []string{}
}
func (r Ref) Required() []string {
	if refIF, ok := r["required"]; ok {
		return refIF.([]string)
	}
	return []string{}
}
// Required gets a type for a Schema reference, if it exists