Property default values

[chriskapp]

It would be useful if there is a way to describe a default value of a property. This could be especially useful in combination with a discriminator type.

To better explain the use case, if we look at the generated code of the TypeSchema spec we see different types i.e. StringPropertyType, IntegerPropertyType, etc. If you now use these types you always need to set the value of the type i.e.

IntegerPropertyType type = new IntegerPropertyType();
type.setType("integer");

It would be much better if the IntegerPropertyType already includes "integer" as default value for the type property.