DEFER - CSD05 - How do we provide constraints on properties declared as simple YAML lists (sets)

By example, we have the following property defn for tosca.capabilities.Container:

property name: containee_types
required: yes
type: Node Type[]

Description: A list of one or more Node Types that are supported as containees that declare the Container type as a Capability.

Problem 1: how do we constrain list to only include integer types?
Problem 2: how do we constrain list to have at least one valid entry?