I need to override some elements and change the way they are
serialized depending on other fields within the object. Below the type
of object in the list of lists (data) depends on the column object
within the same object. How can I do this?

I could use just the low level expression stuff which I can then
traverse to build my own structure but can't find a tutorial on using
this without extras of the serializer.

Any tips?

    public class PyTable
    {
        String id;
        String name;
        List<PyColumn> columns = new List<PyColumn>();
        List<List<Object>> data = new List<List<Object>>();
    }

    public class PyColumn
    {
        const int TEXT = 0;
        const int INTEGER = 1;
        const int FLOAT = 2;
        const int DATE = 3;

        String id;
        String name;
        int typeId;
    }