Using XNA's XML content importer, is it possible to read in an array of objects with different subtypes?

For instance, assume these are my class definitions:

    public abstract class MyBaseClass
    {
        public string MyBaseData;
    }
    
    public class MySubClass0 : MyBaseClass
    {
        public int MySubData0;
    }
    
    public class MySubClass1 : MyBaseClass
    {
        public bool MySubData1;
    }

And this is my XML file:

    <XnaContent>
        <Asset Type="MyBaseClass[]">
            <Item> <!-- I want this to be an instance of MySubClass0 -->
                <MyBaseData>alpha</MyBaseData>
                <MySubData0>314</MySubData0>
            </Item>
            <Item>  <!-- I want this to be an instance of MySubClass1 -->
                <MyBaseData>bravo</MyBaseData>
                <MySubData1>true</MySubData1>
            </Item>
        </Asset>
    </XnaContent>

How do I specify that I want the first Item to be an instance of MySubclass0 and the second Item to be an instance of MySubclass1?


**Edit**: I managed to answer my own question by hand creating an instance of my object array and then following the instructions in this article to write the array to xml:
http://msdn.microsoft.com/en-us/library/ff604982.aspx

Looking at the output, it appears I needed a Type attribute on each Item node to specify the type.  So my modified XML file looks like this:

    <XnaContent>
        <Asset Type="MyBaseClass[]">
            <Item Type="MySubClass0"> 
                <MyBaseData>alpha</MyBaseData>
                <MySubData0>314</MySubData0>
            </Item>
            <Item Type="MySubClass1">
                <MyBaseData>bravo</MyBaseData>
                <MySubData1>true</MySubData1>
            </Item>
        </Asset>
    </XnaContent>