Class inside Page Type

Hello,

I would like to know if it's considered as a normal practise to include a Class under the Page Type, since that Class is closely related to a Page Type.

Something like:

public class SomePage : PageData 
{
    ... some page properties...
    public class RelatedToSomePageClass 
    {
        public string Title { get; set; }
        public XhtmlString Content { get; set; }
    }
}

Thanks!