Add support for defining virtual fields that are of type collection or array. This should work already in theory, but no matter what I tried, I got errors, so it may simply be broken. There is also one piece missing. There needs to be a way to specify the collection type parameter (item type). I'm envisioning something like this:

<List>
<Integer/> <-- defines item type
<app:DiceValues/>
<value>1</value>
<value>2</value>
<value>3</value>
<value>4</value>
<value>5</value>
<value>6</value>
</List>

defines the virtual field:

@DiceValues
List<Integer> anonymous;

In the same way, we should support virtual arrays:

<array>
<Integer/>
<app:DiceValues/>
<value>1</value>
<value>2</value>
<value>3</value>
<value>4</value>
<value>5</value>
<value>6</value>
</array>

producing:

@DiceValues
Integer[] anonymous;

The nested element for the type is a bit awkward, though (I suggested it because it's currently how array's are typed). It would make more sense to use an attribute here:

<List itemType="java.lang.Integer">
...
</List>

Also, a way to control the implementation type:

<List type="java.util.ArrayList" itemType="java.lang.Integer">
...
</List>

Once working, there definitely needs to be an example (or two) added to the documentation.