How to set nullable properties to null?

Hi,

I am having a problem setting certain properties to null so that the consumer receives these values like this:

...

<d:mydate m:null="true"/>

...

which works the Edm.DateTime and when the date value is initial.

Now I would like to achieve the same result with two other properties of type Edm.Boolean and Edm.Int16. Initial values of these types will result in false and 0, which is a total different meaning to the consumer:

Currently:

<d:mybool>false</d:mybool>

Wanted_

<d:mybool m:null="true"/> or <d:mybool/>

Thanks,

Christoph