Vala interface with get function - compilation error

I am relatively new to Vala , and I am trying to port some C # code to vala manually, and I started with a trivial example to test it.

C # codes recognize the snippet below as a mapping 1-1 to C #.

Here is the test file vala Universe.vala:

namespace Universe
{
    public interface Planet
    {
        string Name { get; }
    }
}

I get a compilation error:

Universe.vala: error: getter property must have body

Vala doesn't seem to support get (set) ter properties in interfaces - or am I missing something ?. How to fix it?